WebPageVisibilityState 3916 Source/web/WebViewImpl.cpp void WebViewImpl::setVisibilityState(WebPageVisibilityState visibilityState,
WebPageVisibilityState  456 Source/web/WebViewImpl.h     virtual void setVisibilityState(WebPageVisibilityState, bool) OVERRIDE;
WebPageVisibilityState  469 public/web/WebView.h     virtual void setVisibilityState(WebPageVisibilityState visibilityState,
WebPageVisibilityState  363 public/web/WebViewClient.h     virtual WebPageVisibilityState visibilityState() const