root/chrome/browser/metrics/metrics_log.cc

DEFINITIONS

1. GetMetricsEnabledDate
2. AsOmniboxEventInputType
3. AsOmniboxEventResultType
4. AsOmniboxEventPageClassification
5. AsProtobufProcessType
6. ComputeSHA1
7. GetPluginPrefs
8. SetPluginInfo
9. WriteFieldTrials
10. MapThreadName
11. NormalizeFileName
12. WriteProfilerData
13. ProductDataToProto
14. GetMonitorDPICallback
15. WriteScreenDPIInformationProto
16. RoundSecondsToHour
17. extension_metrics_
18. RegisterPrefs
19. GetVersionString
20. set_version_extension
21. version_extension
22. RecordStabilityMetrics
23. GetPrefService
24. GetScreenSize
25. GetScreenDeviceScaleFactor
26. GetScreenCount
27. GetFieldTrialIds
28. HasEnvironment
29. HasStabilityMetrics
30. WritePluginStabilityElements
31. WriteRequiredStabilityAttributes
32. WriteRealtimeStabilityAttributes
33. WritePluginList
34. RecordEnvironment
35. LoadSavedEnvironmentFromPrefs
36. RecordProfilerData
37. RecordOmniboxOpenedURL
38. WriteGoogleUpdateProto

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/metrics/metrics_log.h"

#include <algorithm>
#include <string>
#include <vector>

#include "base/base64.h"
#include "base/basictypes.h"
#include "base/bind.h"
#include "base/cpu.h"
#include "base/lazy_instance.h"
#include "base/memory/scoped_ptr.h"
#include "base/prefs/pref_registry_simple.h"
#include "base/prefs/pref_service.h"
#include "base/profiler/alternate_timer.h"
#include "base/sha1.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/sys_info.h"
#include "base/third_party/nspr/prtime.h"
#include "base/time/time.h"
#include "base/tracked_objects.h"
#include "chrome/browser/autocomplete/autocomplete_input.h"
#include "chrome/browser/autocomplete/autocomplete_match.h"
#include "chrome/browser/autocomplete/autocomplete_provider.h"
#include "chrome/browser/autocomplete/autocomplete_result.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/google/google_util.h"
#include "chrome/browser/metrics/extension_metrics.h"
#include "chrome/browser/omnibox/omnibox_log.h"
#include "chrome/browser/plugins/plugin_prefs.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/logging_chrome.h"
#include "chrome/common/metrics/proto/omnibox_event.pb.h"
#include "chrome/common/metrics/proto/profiler_event.pb.h"
#include "chrome/common/metrics/proto/system_profile.pb.h"
#include "chrome/common/metrics/variations/variations_util.h"
#include "chrome/common/pref_names.h"
#include "chrome/installer/util/google_update_settings.h"
#include "components/nacl/common/nacl_process_type.h"
#include "content/public/browser/gpu_data_manager.h"
#include "content/public/common/content_client.h"
#include "content/public/common/webplugininfo.h"
#include "gpu/config/gpu_info.h"
#include "ui/gfx/screen.h"
#include "url/gurl.h"

#if defined(OS_ANDROID)
#include "base/android/build_info.h"
#endif

#if defined(OS_WIN)
#include "base/win/metro.h"

// http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
extern "C" IMAGE_DOS_HEADER __ImageBase;
#endif

#if defined(OS_CHROMEOS)
#include "chrome/browser/metrics/metrics_log_chromeos.h"
#endif  // OS_CHROMEOS

using content::GpuDataManager;
using metrics::OmniboxEventProto;
using metrics::ProfilerEventProto;
using metrics::SystemProfileProto;
using tracked_objects::ProcessDataSnapshot;
typedef chrome_variations::ActiveGroupId ActiveGroupId;
typedef SystemProfileProto::GoogleUpdate::ProductInfo ProductInfo;

namespace {

// Returns the date at which the current metrics client ID was created as
// a string containing seconds since the epoch, or "0" if none was found.
std::string GetMetricsEnabledDate(PrefService* pref) {
  if (!pref) {
    NOTREACHED();
    return "0";
  }

  return pref->GetString(prefs::kMetricsReportingEnabledTimestamp);
}

OmniboxEventProto::InputType AsOmniboxEventInputType(
    AutocompleteInput::Type type) {
  switch (type) {
    case AutocompleteInput::INVALID:
      return OmniboxEventProto::INVALID;
    case AutocompleteInput::UNKNOWN:
      return OmniboxEventProto::UNKNOWN;
    case AutocompleteInput::URL:
      return OmniboxEventProto::URL;
    case AutocompleteInput::QUERY:
      return OmniboxEventProto::QUERY;
    case AutocompleteInput::FORCED_QUERY:
      return OmniboxEventProto::FORCED_QUERY;
    default:
      NOTREACHED();
      return OmniboxEventProto::INVALID;
  }
}

OmniboxEventProto::Suggestion::ResultType AsOmniboxEventResultType(
    AutocompleteMatch::Type type) {
  switch (type) {
    case AutocompleteMatchType::URL_WHAT_YOU_TYPED:
      return OmniboxEventProto::Suggestion::URL_WHAT_YOU_TYPED;
    case AutocompleteMatchType::HISTORY_URL:
      return OmniboxEventProto::Suggestion::HISTORY_URL;
    case AutocompleteMatchType::HISTORY_TITLE:
      return OmniboxEventProto::Suggestion::HISTORY_TITLE;
    case AutocompleteMatchType::HISTORY_BODY:
      return OmniboxEventProto::Suggestion::HISTORY_BODY;
    case AutocompleteMatchType::HISTORY_KEYWORD:
      return OmniboxEventProto::Suggestion::HISTORY_KEYWORD;
    case AutocompleteMatchType::NAVSUGGEST:
      return OmniboxEventProto::Suggestion::NAVSUGGEST;
    case AutocompleteMatchType::SEARCH_WHAT_YOU_TYPED:
      return OmniboxEventProto::Suggestion::SEARCH_WHAT_YOU_TYPED;
    case AutocompleteMatchType::SEARCH_HISTORY:
      return OmniboxEventProto::Suggestion::SEARCH_HISTORY;
    case AutocompleteMatchType::SEARCH_SUGGEST:
      return OmniboxEventProto::Suggestion::SEARCH_SUGGEST;
    case AutocompleteMatchType::SEARCH_SUGGEST_ENTITY:
      return OmniboxEventProto::Suggestion::SEARCH_SUGGEST_ENTITY;
    case AutocompleteMatchType::SEARCH_SUGGEST_INFINITE:
      return OmniboxEventProto::Suggestion::SEARCH_SUGGEST_INFINITE;
    case AutocompleteMatchType::SEARCH_SUGGEST_PERSONALIZED:
      return OmniboxEventProto::Suggestion::SEARCH_SUGGEST_PERSONALIZED;
    case AutocompleteMatchType::SEARCH_SUGGEST_PROFILE:
      return OmniboxEventProto::Suggestion::SEARCH_SUGGEST_PROFILE;
    case AutocompleteMatchType::SEARCH_OTHER_ENGINE:
      return OmniboxEventProto::Suggestion::SEARCH_OTHER_ENGINE;
    case AutocompleteMatchType::EXTENSION_APP:
      return OmniboxEventProto::Suggestion::EXTENSION_APP;
    case AutocompleteMatchType::BOOKMARK_TITLE:
      return OmniboxEventProto::Suggestion::BOOKMARK_TITLE;
    default:
      NOTREACHED();
      return OmniboxEventProto::Suggestion::UNKNOWN_RESULT_TYPE;
  }
}

OmniboxEventProto::PageClassification AsOmniboxEventPageClassification(
    AutocompleteInput::PageClassification page_classification) {
  switch (page_classification) {
    case AutocompleteInput::INVALID_SPEC:
      return OmniboxEventProto::INVALID_SPEC;
    case AutocompleteInput::NTP:
      return OmniboxEventProto::NTP;
    case AutocompleteInput::BLANK:
      return OmniboxEventProto::BLANK;
    case AutocompleteInput::HOME_PAGE:
      return OmniboxEventProto::HOME_PAGE;
    case AutocompleteInput::OTHER:
      return OmniboxEventProto::OTHER;
    case AutocompleteInput::SEARCH_RESULT_PAGE_DOING_SEARCH_TERM_REPLACEMENT:
      return OmniboxEventProto::
          SEARCH_RESULT_PAGE_DOING_SEARCH_TERM_REPLACEMENT;
    case AutocompleteInput::INSTANT_NTP_WITH_OMNIBOX_AS_STARTING_FOCUS:
      return OmniboxEventProto::INSTANT_NTP_WITH_OMNIBOX_AS_STARTING_FOCUS;
    case AutocompleteInput::INSTANT_NTP_WITH_FAKEBOX_AS_STARTING_FOCUS:
      return OmniboxEventProto::INSTANT_NTP_WITH_FAKEBOX_AS_STARTING_FOCUS;
    case AutocompleteInput::SEARCH_RESULT_PAGE_NO_SEARCH_TERM_REPLACEMENT:
      return OmniboxEventProto::
          SEARCH_RESULT_PAGE_NO_SEARCH_TERM_REPLACEMENT;
  }
  return OmniboxEventProto::INVALID_SPEC;
}

ProfilerEventProto::TrackedObject::ProcessType AsProtobufProcessType(
    int process_type) {
  switch (process_type) {
    case content::PROCESS_TYPE_BROWSER:
      return ProfilerEventProto::TrackedObject::BROWSER;
    case content::PROCESS_TYPE_RENDERER:
      return ProfilerEventProto::TrackedObject::RENDERER;
    case content::PROCESS_TYPE_PLUGIN:
      return ProfilerEventProto::TrackedObject::PLUGIN;
    case content::PROCESS_TYPE_WORKER:
      return ProfilerEventProto::TrackedObject::WORKER;
    case content::PROCESS_TYPE_UTILITY:
      return ProfilerEventProto::TrackedObject::UTILITY;
    case content::PROCESS_TYPE_ZYGOTE:
      return ProfilerEventProto::TrackedObject::ZYGOTE;
    case content::PROCESS_TYPE_SANDBOX_HELPER:
      return ProfilerEventProto::TrackedObject::SANDBOX_HELPER;
    case content::PROCESS_TYPE_GPU:
      return ProfilerEventProto::TrackedObject::GPU;
    case content::PROCESS_TYPE_PPAPI_PLUGIN:
      return ProfilerEventProto::TrackedObject::PPAPI_PLUGIN;
    case content::PROCESS_TYPE_PPAPI_BROKER:
      return ProfilerEventProto::TrackedObject::PPAPI_BROKER;
    case PROCESS_TYPE_NACL_LOADER:
      return ProfilerEventProto::TrackedObject::NACL_LOADER;
    case PROCESS_TYPE_NACL_BROKER:
      return ProfilerEventProto::TrackedObject::NACL_BROKER;
    default:
      NOTREACHED();
      return ProfilerEventProto::TrackedObject::UNKNOWN;
  }
}

// Computes a SHA-1 hash of |data| and returns it as a hex string.
std::string ComputeSHA1(const std::string& data) {
  const std::string sha1 = base::SHA1HashString(data);
  return base::HexEncode(sha1.data(), sha1.size());
}

#if defined(ENABLE_PLUGINS)
// Returns the plugin preferences corresponding for this user, if available.
// If multiple user profiles are loaded, returns the preferences corresponding
// to an arbitrary one of the profiles.
PluginPrefs* GetPluginPrefs() {
  ProfileManager* profile_manager = g_browser_process->profile_manager();

  if (!profile_manager) {
    // The profile manager can be NULL when testing.
    return NULL;
  }

  std::vector<Profile*> profiles = profile_manager->GetLoadedProfiles();
  if (profiles.empty())
    return NULL;

  return PluginPrefs::GetForProfile(profiles.front()).get();
}

// Fills |plugin| with the info contained in |plugin_info| and |plugin_prefs|.
void SetPluginInfo(const content::WebPluginInfo& plugin_info,
                   const PluginPrefs* plugin_prefs,
                   SystemProfileProto::Plugin* plugin) {
  plugin->set_name(base::UTF16ToUTF8(plugin_info.name));
  plugin->set_filename(plugin_info.path.BaseName().AsUTF8Unsafe());
  plugin->set_version(base::UTF16ToUTF8(plugin_info.version));
  plugin->set_is_pepper(plugin_info.is_pepper_plugin());
  if (plugin_prefs)
    plugin->set_is_disabled(!plugin_prefs->IsPluginEnabled(plugin_info));
}
#endif  // defined(ENABLE_PLUGINS)

void WriteFieldTrials(const std::vector<ActiveGroupId>& field_trial_ids,
                      SystemProfileProto* system_profile) {
  for (std::vector<ActiveGroupId>::const_iterator it =
       field_trial_ids.begin(); it != field_trial_ids.end(); ++it) {
    SystemProfileProto::FieldTrial* field_trial =
        system_profile->add_field_trial();
    field_trial->set_name_id(it->name);
    field_trial->set_group_id(it->group);
  }
}

// Maps a thread name by replacing trailing sequence of digits with "*".
// Examples:
// 1. "BrowserBlockingWorker1/23857" => "BrowserBlockingWorker1/*"
// 2. "Chrome_IOThread" => "Chrome_IOThread"
std::string MapThreadName(const std::string& thread_name) {
  size_t i = thread_name.length();

  while (i > 0 && isdigit(thread_name[i - 1])) {
    --i;
  }

  if (i == thread_name.length())
    return thread_name;

  return thread_name.substr(0, i) + '*';
}

// Normalizes a source filename (which is platform- and build-method-dependent)
// by extracting the last component of the full file name.
// Example: "c:\b\build\slave\win\build\src\chrome\app\chrome_main.cc" =>
// "chrome_main.cc".
std::string NormalizeFileName(const std::string& file_name) {
  const size_t offset = file_name.find_last_of("\\/");
  return offset != std::string::npos ? file_name.substr(offset + 1) : file_name;
}

void WriteProfilerData(const ProcessDataSnapshot& profiler_data,
                       int process_type,
                       ProfilerEventProto* performance_profile) {
  for (std::vector<tracked_objects::TaskSnapshot>::const_iterator it =
           profiler_data.tasks.begin();
       it != profiler_data.tasks.end(); ++it) {
    const tracked_objects::DeathDataSnapshot& death_data = it->death_data;
    ProfilerEventProto::TrackedObject* tracked_object =
        performance_profile->add_tracked_object();
    tracked_object->set_birth_thread_name_hash(
        MetricsLogBase::Hash(MapThreadName(it->birth.thread_name)));
    tracked_object->set_exec_thread_name_hash(
        MetricsLogBase::Hash(MapThreadName(it->death_thread_name)));
    tracked_object->set_source_file_name_hash(
        MetricsLogBase::Hash(NormalizeFileName(it->birth.location.file_name)));
    tracked_object->set_source_function_name_hash(
        MetricsLogBase::Hash(it->birth.location.function_name));
    tracked_object->set_source_line_number(it->birth.location.line_number);
    tracked_object->set_exec_count(death_data.count);
    tracked_object->set_exec_time_total(death_data.run_duration_sum);
    tracked_object->set_exec_time_sampled(death_data.run_duration_sample);
    tracked_object->set_queue_time_total(death_data.queue_duration_sum);
    tracked_object->set_queue_time_sampled(death_data.queue_duration_sample);
    tracked_object->set_process_type(AsProtobufProcessType(process_type));
    tracked_object->set_process_id(profiler_data.process_id);
  }
}

#if defined(GOOGLE_CHROME_BUILD) && defined(OS_WIN)
void ProductDataToProto(const GoogleUpdateSettings::ProductData& product_data,
                        ProductInfo* product_info) {
  product_info->set_version(product_data.version);
  product_info->set_last_update_success_timestamp(
      product_data.last_success.ToTimeT());
  product_info->set_last_error(product_data.last_error_code);
  product_info->set_last_extra_error(product_data.last_extra_code);
  if (ProductInfo::InstallResult_IsValid(product_data.last_result)) {
    product_info->set_last_result(
        static_cast<ProductInfo::InstallResult>(product_data.last_result));
  }
}
#endif

#if defined(OS_WIN)
struct ScreenDPIInformation {
  double max_dpi_x;
  double max_dpi_y;
};

// Called once for each connected monitor.
BOOL CALLBACK GetMonitorDPICallback(HMONITOR, HDC hdc, LPRECT, LPARAM dwData) {
  const double kMillimetersPerInch = 25.4;
  ScreenDPIInformation* screen_info =
      reinterpret_cast<ScreenDPIInformation*>(dwData);
  // Size of screen, in mm.
  DWORD size_x = GetDeviceCaps(hdc, HORZSIZE);
  DWORD size_y = GetDeviceCaps(hdc, VERTSIZE);
  double dpi_x = (size_x > 0) ?
      GetDeviceCaps(hdc, HORZRES) / (size_x / kMillimetersPerInch) : 0;
  double dpi_y = (size_y > 0) ?
      GetDeviceCaps(hdc, VERTRES) / (size_y / kMillimetersPerInch) : 0;
  screen_info->max_dpi_x = std::max(dpi_x, screen_info->max_dpi_x);
  screen_info->max_dpi_y = std::max(dpi_y, screen_info->max_dpi_y);
  return TRUE;
}

void WriteScreenDPIInformationProto(SystemProfileProto::Hardware* hardware) {
  HDC desktop_dc = GetDC(NULL);
  if (desktop_dc) {
    ScreenDPIInformation si = {0, 0};
    if (EnumDisplayMonitors(desktop_dc, NULL, GetMonitorDPICallback,
            reinterpret_cast<LPARAM>(&si))) {
      hardware->set_max_dpi_x(si.max_dpi_x);
      hardware->set_max_dpi_y(si.max_dpi_y);
    }
    ReleaseDC(GetDesktopWindow(), desktop_dc);
  }
}

#endif  // defined(OS_WIN)

// Round a timestamp measured in seconds since epoch to one with a granularity
// of an hour. This can be used before uploaded potentially sensitive
// timestamps.
int64 RoundSecondsToHour(int64 time_in_seconds) {
  return 3600 * (time_in_seconds / 3600);
}

}  // namespace

GoogleUpdateMetrics::GoogleUpdateMetrics() : is_system_install(false) {}

GoogleUpdateMetrics::~GoogleUpdateMetrics() {}

static base::LazyInstance<std::string>::Leaky
    g_version_extension = LAZY_INSTANCE_INITIALIZER;

MetricsLog::MetricsLog(const std::string& client_id, int session_id)
    : MetricsLogBase(client_id, session_id, MetricsLog::GetVersionString()),
      creation_time_(base::TimeTicks::Now()),
      extension_metrics_(uma_proto()->client_id()) {
#if defined(OS_CHROMEOS)
  metrics_log_chromeos_.reset(new MetricsLogChromeOS(uma_proto()));
#endif  // OS_CHROMEOS
}

MetricsLog::~MetricsLog() {}

// static
void MetricsLog::RegisterPrefs(PrefRegistrySimple* registry) {
  registry->RegisterListPref(prefs::kStabilityPluginStats);
}

// static
std::string MetricsLog::GetVersionString() {
  chrome::VersionInfo version_info;
  if (!version_info.is_valid()) {
    NOTREACHED() << "Unable to retrieve version info.";
    return std::string();
  }

  std::string version = version_info.Version();
  if (!version_extension().empty())
    version += version_extension();
  if (!version_info.IsOfficialBuild())
    version.append("-devel");
  return version;
}

// static
void MetricsLog::set_version_extension(const std::string& extension) {
  g_version_extension.Get() = extension;
}

// static
const std::string& MetricsLog::version_extension() {
  return g_version_extension.Get();
}

void MetricsLog::RecordStabilityMetrics(base::TimeDelta incremental_uptime,
                                        base::TimeDelta uptime,
                                        LogType log_type) {
  DCHECK_NE(NO_LOG, log_type);
  DCHECK(!locked());
  DCHECK(HasEnvironment());
  DCHECK(!HasStabilityMetrics());

  PrefService* pref = GetPrefService();
  DCHECK(pref);

  // Get stability attributes out of Local State, zeroing out stored values.
  // NOTE: This could lead to some data loss if this report isn't successfully
  //       sent, but that's true for all the metrics.

  WriteRequiredStabilityAttributes(pref);
  WritePluginStabilityElements(pref);

  // Record recent delta for critical stability metrics.  We can't wait for a
  // restart to gather these, as that delay biases our observation away from
  // users that run happily for a looooong time.  We send increments with each
  // uma log upload, just as we send histogram data.
  WriteRealtimeStabilityAttributes(pref, incremental_uptime, uptime);

  // Omit some stats unless this is the initial stability log.
  if (log_type != INITIAL_LOG)
    return;

  int incomplete_shutdown_count =
      pref->GetInteger(prefs::kStabilityIncompleteSessionEndCount);
  pref->SetInteger(prefs::kStabilityIncompleteSessionEndCount, 0);
  int breakpad_registration_success_count =
      pref->GetInteger(prefs::kStabilityBreakpadRegistrationSuccess);
  pref->SetInteger(prefs::kStabilityBreakpadRegistrationSuccess, 0);
  int breakpad_registration_failure_count =
      pref->GetInteger(prefs::kStabilityBreakpadRegistrationFail);
  pref->SetInteger(prefs::kStabilityBreakpadRegistrationFail, 0);
  int debugger_present_count =
      pref->GetInteger(prefs::kStabilityDebuggerPresent);
  pref->SetInteger(prefs::kStabilityDebuggerPresent, 0);
  int debugger_not_present_count =
      pref->GetInteger(prefs::kStabilityDebuggerNotPresent);
  pref->SetInteger(prefs::kStabilityDebuggerNotPresent, 0);

  // TODO(jar): The following are all optional, so we *could* optimize them for
  // values of zero (and not include them).
  SystemProfileProto::Stability* stability =
      uma_proto()->mutable_system_profile()->mutable_stability();
  stability->set_incomplete_shutdown_count(incomplete_shutdown_count);
  stability->set_breakpad_registration_success_count(
      breakpad_registration_success_count);
  stability->set_breakpad_registration_failure_count(
      breakpad_registration_failure_count);
  stability->set_debugger_present_count(debugger_present_count);
  stability->set_debugger_not_present_count(debugger_not_present_count);
}

PrefService* MetricsLog::GetPrefService() {
  return g_browser_process->local_state();
}

gfx::Size MetricsLog::GetScreenSize() const {
  return gfx::Screen::GetNativeScreen()->GetPrimaryDisplay().GetSizeInPixel();
}

float MetricsLog::GetScreenDeviceScaleFactor() const {
  return gfx::Screen::GetNativeScreen()->
      GetPrimaryDisplay().device_scale_factor();
}

int MetricsLog::GetScreenCount() const {
  // TODO(scottmg): NativeScreen maybe wrong. http://crbug.com/133312
  return gfx::Screen::GetNativeScreen()->GetNumDisplays();
}

void MetricsLog::GetFieldTrialIds(
    std::vector<ActiveGroupId>* field_trial_ids) const {
  chrome_variations::GetFieldTrialActiveGroupIds(field_trial_ids);
}

bool MetricsLog::HasEnvironment() const {
  return uma_proto()->system_profile().has_uma_enabled_date();
}

bool MetricsLog::HasStabilityMetrics() const {
  return uma_proto()->system_profile().stability().has_launch_count();
}

void MetricsLog::WritePluginStabilityElements(PrefService* pref) {
  // Now log plugin stability info.
  const base::ListValue* plugin_stats_list = pref->GetList(
      prefs::kStabilityPluginStats);
  if (!plugin_stats_list)
    return;

#if defined(ENABLE_PLUGINS)
  SystemProfileProto::Stability* stability =
      uma_proto()->mutable_system_profile()->mutable_stability();
  for (base::ListValue::const_iterator iter = plugin_stats_list->begin();
       iter != plugin_stats_list->end(); ++iter) {
    if (!(*iter)->IsType(base::Value::TYPE_DICTIONARY)) {
      NOTREACHED();
      continue;
    }
    base::DictionaryValue* plugin_dict =
        static_cast<base::DictionaryValue*>(*iter);

    // Note that this search is potentially a quadratic operation, but given the
    // low number of plugins installed on a "reasonable" setup, this should be
    // fine.
    // TODO(isherman): Verify that this does not show up as a hotspot in
    // profiler runs.
    const SystemProfileProto::Plugin* system_profile_plugin = NULL;
    std::string plugin_name;
    plugin_dict->GetString(prefs::kStabilityPluginName, &plugin_name);
    const SystemProfileProto& system_profile = uma_proto()->system_profile();
    for (int i = 0; i < system_profile.plugin_size(); ++i) {
      if (system_profile.plugin(i).name() == plugin_name) {
        system_profile_plugin = &system_profile.plugin(i);
        break;
      }
    }

    if (!system_profile_plugin) {
      NOTREACHED();
      continue;
    }

    SystemProfileProto::Stability::PluginStability* plugin_stability =
        stability->add_plugin_stability();
    *plugin_stability->mutable_plugin() = *system_profile_plugin;

    int launches = 0;
    plugin_dict->GetInteger(prefs::kStabilityPluginLaunches, &launches);
    if (launches > 0)
      plugin_stability->set_launch_count(launches);

    int instances = 0;
    plugin_dict->GetInteger(prefs::kStabilityPluginInstances, &instances);
    if (instances > 0)
      plugin_stability->set_instance_count(instances);

    int crashes = 0;
    plugin_dict->GetInteger(prefs::kStabilityPluginCrashes, &crashes);
    if (crashes > 0)
      plugin_stability->set_crash_count(crashes);

    int loading_errors = 0;
    plugin_dict->GetInteger(prefs::kStabilityPluginLoadingErrors,
                            &loading_errors);
    if (loading_errors > 0)
      plugin_stability->set_loading_error_count(loading_errors);
  }
#endif  // defined(ENABLE_PLUGINS)

  pref->ClearPref(prefs::kStabilityPluginStats);
}

// The server refuses data that doesn't have certain values.  crashcount and
// launchcount are currently "required" in the "stability" group.
// TODO(isherman): Stop writing these attributes specially once the migration to
// protobufs is complete.
void MetricsLog::WriteRequiredStabilityAttributes(PrefService* pref) {
  int launch_count = pref->GetInteger(prefs::kStabilityLaunchCount);
  pref->SetInteger(prefs::kStabilityLaunchCount, 0);
  int crash_count = pref->GetInteger(prefs::kStabilityCrashCount);
  pref->SetInteger(prefs::kStabilityCrashCount, 0);

  SystemProfileProto::Stability* stability =
      uma_proto()->mutable_system_profile()->mutable_stability();
  stability->set_launch_count(launch_count);
  stability->set_crash_count(crash_count);
}

void MetricsLog::WriteRealtimeStabilityAttributes(
    PrefService* pref,
    base::TimeDelta incremental_uptime,
    base::TimeDelta uptime) {
  // Update the stats which are critical for real-time stability monitoring.
  // Since these are "optional," only list ones that are non-zero, as the counts
  // are aggregated (summed) server side.

  SystemProfileProto::Stability* stability =
      uma_proto()->mutable_system_profile()->mutable_stability();
  int count = pref->GetInteger(prefs::kStabilityPageLoadCount);
  if (count) {
    stability->set_page_load_count(count);
    pref->SetInteger(prefs::kStabilityPageLoadCount, 0);
  }

  count = pref->GetInteger(prefs::kStabilityRendererCrashCount);
  if (count) {
    stability->set_renderer_crash_count(count);
    pref->SetInteger(prefs::kStabilityRendererCrashCount, 0);
  }

  count = pref->GetInteger(prefs::kStabilityExtensionRendererCrashCount);
  if (count) {
    stability->set_extension_renderer_crash_count(count);
    pref->SetInteger(prefs::kStabilityExtensionRendererCrashCount, 0);
  }

  count = pref->GetInteger(prefs::kStabilityRendererHangCount);
  if (count) {
    stability->set_renderer_hang_count(count);
    pref->SetInteger(prefs::kStabilityRendererHangCount, 0);
  }

  count = pref->GetInteger(prefs::kStabilityChildProcessCrashCount);
  if (count) {
    stability->set_child_process_crash_count(count);
    pref->SetInteger(prefs::kStabilityChildProcessCrashCount, 0);
  }

#if defined(OS_CHROMEOS)
  metrics_log_chromeos_->WriteRealtimeStabilityAttributes(pref);
#endif  // OS_CHROMEOS

  const uint64 incremental_uptime_sec = incremental_uptime.InSeconds();
  if (incremental_uptime_sec)
    stability->set_incremental_uptime_sec(incremental_uptime_sec);
  const uint64 uptime_sec = uptime.InSeconds();
  if (uptime_sec)
    stability->set_uptime_sec(uptime_sec);
}

void MetricsLog::WritePluginList(
    const std::vector<content::WebPluginInfo>& plugin_list) {
  DCHECK(!locked());

#if defined(ENABLE_PLUGINS)
  PluginPrefs* plugin_prefs = GetPluginPrefs();
  SystemProfileProto* system_profile = uma_proto()->mutable_system_profile();
  for (std::vector<content::WebPluginInfo>::const_iterator iter =
           plugin_list.begin();
       iter != plugin_list.end(); ++iter) {
    SystemProfileProto::Plugin* plugin = system_profile->add_plugin();
    SetPluginInfo(*iter, plugin_prefs, plugin);
  }
#endif  // defined(ENABLE_PLUGINS)
}

void MetricsLog::RecordEnvironment(
    const std::vector<content::WebPluginInfo>& plugin_list,
    const GoogleUpdateMetrics& google_update_metrics,
    const std::vector<chrome_variations::ActiveGroupId>& synthetic_trials) {
  DCHECK(!HasEnvironment());

  SystemProfileProto* system_profile = uma_proto()->mutable_system_profile();

  std::string brand_code;
  if (google_util::GetBrand(&brand_code))
    system_profile->set_brand_code(brand_code);

  int enabled_date;
  bool success = base::StringToInt(GetMetricsEnabledDate(GetPrefService()),
                                   &enabled_date);
  DCHECK(success);

  // Reduce granularity of the enabled_date field to nearest hour.
  system_profile->set_uma_enabled_date(RoundSecondsToHour(enabled_date));

  int64 install_date = GetPrefService()->GetInt64(prefs::kInstallDate);

  // Reduce granularity of the install_date field to nearest hour.
  system_profile->set_install_date(RoundSecondsToHour(install_date));

  system_profile->set_application_locale(
      g_browser_process->GetApplicationLocale());

  SystemProfileProto::Hardware* hardware = system_profile->mutable_hardware();
  hardware->set_cpu_architecture(base::SysInfo::OperatingSystemArchitecture());
  hardware->set_system_ram_mb(base::SysInfo::AmountOfPhysicalMemoryMB());
#if defined(OS_WIN)
  hardware->set_dll_base(reinterpret_cast<uint64>(&__ImageBase));
#endif

  SystemProfileProto::Network* network = system_profile->mutable_network();
  network->set_connection_type_is_ambiguous(
      network_observer_.connection_type_is_ambiguous());
  network->set_connection_type(network_observer_.connection_type());
  network->set_wifi_phy_layer_protocol_is_ambiguous(
      network_observer_.wifi_phy_layer_protocol_is_ambiguous());
  network->set_wifi_phy_layer_protocol(
      network_observer_.wifi_phy_layer_protocol());
  network_observer_.Reset();

  SystemProfileProto::OS* os = system_profile->mutable_os();
  std::string os_name = base::SysInfo::OperatingSystemName();
#if defined(OS_WIN)
  // TODO(mad): This only checks whether the main process is a Metro process at
  // upload time; not whether the collected metrics were all gathered from
  // Metro.  This is ok as an approximation for now, since users will rarely be
  // switching from Metro to Desktop mode; but we should re-evaluate whether we
  // can distinguish metrics more cleanly in the future: http://crbug.com/140568
  if (base::win::IsMetroProcess())
    os_name += " (Metro)";
#endif
  os->set_name(os_name);
  os->set_version(base::SysInfo::OperatingSystemVersion());
#if defined(OS_ANDROID)
  os->set_fingerprint(
      base::android::BuildInfo::GetInstance()->android_build_fp());
#endif

  base::CPU cpu_info;
  SystemProfileProto::Hardware::CPU* cpu = hardware->mutable_cpu();
  cpu->set_vendor_name(cpu_info.vendor_name());
  cpu->set_signature(cpu_info.signature());

  const gpu::GPUInfo& gpu_info =
      GpuDataManager::GetInstance()->GetGPUInfo();
  SystemProfileProto::Hardware::Graphics* gpu = hardware->mutable_gpu();
  gpu->set_vendor_id(gpu_info.gpu.vendor_id);
  gpu->set_device_id(gpu_info.gpu.device_id);
  gpu->set_driver_version(gpu_info.driver_version);
  gpu->set_driver_date(gpu_info.driver_date);
  SystemProfileProto::Hardware::Graphics::PerformanceStatistics*
      gpu_performance = gpu->mutable_performance_statistics();
  gpu_performance->set_graphics_score(gpu_info.performance_stats.graphics);
  gpu_performance->set_gaming_score(gpu_info.performance_stats.gaming);
  gpu_performance->set_overall_score(gpu_info.performance_stats.overall);
  gpu->set_gl_vendor(gpu_info.gl_vendor);
  gpu->set_gl_renderer(gpu_info.gl_renderer);

  const gfx::Size display_size = GetScreenSize();
  hardware->set_primary_screen_width(display_size.width());
  hardware->set_primary_screen_height(display_size.height());
  hardware->set_primary_screen_scale_factor(GetScreenDeviceScaleFactor());
  hardware->set_screen_count(GetScreenCount());

#if defined(OS_WIN)
  WriteScreenDPIInformationProto(hardware);
#endif

  WriteGoogleUpdateProto(google_update_metrics);

  WritePluginList(plugin_list);
  extension_metrics_.WriteExtensionList(uma_proto()->mutable_system_profile());

  std::vector<ActiveGroupId> field_trial_ids;
  GetFieldTrialIds(&field_trial_ids);
  WriteFieldTrials(field_trial_ids, system_profile);
  WriteFieldTrials(synthetic_trials, system_profile);

#if defined(OS_CHROMEOS)
  metrics_log_chromeos_->LogChromeOSMetrics();
#endif  // OS_CHROMEOS

  std::string serialied_system_profile;
  std::string base64_system_profile;
  if (system_profile->SerializeToString(&serialied_system_profile)) {
    base::Base64Encode(serialied_system_profile, &base64_system_profile);
    PrefService* local_state = GetPrefService();
    local_state->SetString(prefs::kStabilitySavedSystemProfile,
                           base64_system_profile);
    local_state->SetString(prefs::kStabilitySavedSystemProfileHash,
                           ComputeSHA1(serialied_system_profile));
  }
}

bool MetricsLog::LoadSavedEnvironmentFromPrefs() {
  PrefService* local_state = GetPrefService();
  const std::string base64_system_profile =
      local_state->GetString(prefs::kStabilitySavedSystemProfile);
  if (base64_system_profile.empty())
    return false;

  const std::string system_profile_hash =
      local_state->GetString(prefs::kStabilitySavedSystemProfileHash);
  local_state->ClearPref(prefs::kStabilitySavedSystemProfile);
  local_state->ClearPref(prefs::kStabilitySavedSystemProfileHash);

  SystemProfileProto* system_profile = uma_proto()->mutable_system_profile();
  std::string serialied_system_profile;
  return base::Base64Decode(base64_system_profile, &serialied_system_profile) &&
         ComputeSHA1(serialied_system_profile) == system_profile_hash &&
         system_profile->ParseFromString(serialied_system_profile);
}

void MetricsLog::RecordProfilerData(
    const tracked_objects::ProcessDataSnapshot& process_data,
    int process_type) {
  DCHECK(!locked());

  if (tracked_objects::GetTimeSourceType() !=
          tracked_objects::TIME_SOURCE_TYPE_WALL_TIME) {
    // We currently only support the default time source, wall clock time.
    return;
  }

  ProfilerEventProto* profile;
  if (!uma_proto()->profiler_event_size()) {
    // For the first process's data, add a new field to the protocol buffer.
    profile = uma_proto()->add_profiler_event();
    profile->set_profile_type(ProfilerEventProto::STARTUP_PROFILE);
    profile->set_time_source(ProfilerEventProto::WALL_CLOCK_TIME);
  } else {
    // For the remaining calls, re-use the existing field.
    profile = uma_proto()->mutable_profiler_event(0);
  }

  WriteProfilerData(process_data, process_type, profile);
}

void MetricsLog::RecordOmniboxOpenedURL(const OmniboxLog& log) {
  DCHECK(!locked());

  std::vector<base::string16> terms;
  const int num_terms =
      static_cast<int>(Tokenize(log.text, base::kWhitespaceUTF16, &terms));

  OmniboxEventProto* omnibox_event = uma_proto()->add_omnibox_event();
  omnibox_event->set_time(MetricsLogBase::GetCurrentTime());
  if (log.tab_id != -1) {
    // If we know what tab the autocomplete URL was opened in, log it.
    omnibox_event->set_tab_id(log.tab_id);
  }
  omnibox_event->set_typed_length(log.text.length());
  omnibox_event->set_just_deleted_text(log.just_deleted_text);
  omnibox_event->set_num_typed_terms(num_terms);
  omnibox_event->set_selected_index(log.selected_index);
  if (log.completed_length != base::string16::npos)
    omnibox_event->set_completed_length(log.completed_length);
  if (log.elapsed_time_since_user_first_modified_omnibox !=
      base::TimeDelta::FromMilliseconds(-1)) {
    // Only upload the typing duration if it is set/valid.
    omnibox_event->set_typing_duration_ms(
        log.elapsed_time_since_user_first_modified_omnibox.InMilliseconds());
  }
  omnibox_event->set_duration_since_last_default_match_update_ms(
      log.elapsed_time_since_last_change_to_default_match.InMilliseconds());
  omnibox_event->set_current_page_classification(
      AsOmniboxEventPageClassification(log.current_page_classification));
  omnibox_event->set_input_type(AsOmniboxEventInputType(log.input_type));
  omnibox_event->set_is_top_result_hidden_in_dropdown(
      log.result.ShouldHideTopMatch());

  for (AutocompleteResult::const_iterator i(log.result.begin());
       i != log.result.end(); ++i) {
    OmniboxEventProto::Suggestion* suggestion = omnibox_event->add_suggestion();
    suggestion->set_provider(i->provider->AsOmniboxEventProviderType());
    suggestion->set_result_type(AsOmniboxEventResultType(i->type));
    suggestion->set_relevance(i->relevance);
    if (i->typed_count != -1)
      suggestion->set_typed_count(i->typed_count);
    suggestion->set_is_starred(i->starred);
  }
  for (ProvidersInfo::const_iterator i(log.providers_info.begin());
       i != log.providers_info.end(); ++i) {
    OmniboxEventProto::ProviderInfo* provider_info =
        omnibox_event->add_provider_info();
    provider_info->CopyFrom(*i);
  }

  ++num_events_;
}

void MetricsLog::WriteGoogleUpdateProto(
    const GoogleUpdateMetrics& google_update_metrics) {
#if defined(GOOGLE_CHROME_BUILD) && defined(OS_WIN)
  SystemProfileProto::GoogleUpdate* google_update =
      uma_proto()->mutable_system_profile()->mutable_google_update();

  google_update->set_is_system_install(google_update_metrics.is_system_install);

  if (!google_update_metrics.last_started_au.is_null()) {
    google_update->set_last_automatic_start_timestamp(
        google_update_metrics.last_started_au.ToTimeT());
  }

  if (!google_update_metrics.last_checked.is_null()) {
    google_update->set_last_update_check_timestamp(
      google_update_metrics.last_checked.ToTimeT());
  }

  if (!google_update_metrics.google_update_data.version.empty()) {
    ProductDataToProto(google_update_metrics.google_update_data,
                       google_update->mutable_google_update_status());
  }

  if (!google_update_metrics.product_data.version.empty()) {
    ProductDataToProto(google_update_metrics.product_data,
                       google_update->mutable_client_status());
  }
#endif  // defined(GOOGLE_CHROME_BUILD) && defined(OS_WIN)
}