SplitMetricKey    374 chrome/browser/performance_monitor/database.cc         key_builder_->SplitMetricKey(it->key().ToString());
SplitMetricKey    407 chrome/browser/performance_monitor/database.cc     MetricKey split_key = key_builder_->SplitMetricKey(it->key().ToString());
SplitMetricKey     84 chrome/browser/performance_monitor/key_builder.h   MetricKey SplitMetricKey(const std::string& key);