Add Startup.BrowserView.FirstPaint / .CompositingEnded histograms.

components/startup_metric_utils/browser/startup_metric_utils.cc

Index: components/startup_metric_utils/browser/startup_metric_utils.cc
diff --git a/components/startup_metric_utils/browser/startup_metric_utils.cc b/components/startup_metric_utils/browser/startup_metric_utils.cc
index f1ad613d5df94bc95887beaafc255f963664c4c6..aebafa31622dbb9d46fde57d8d603425e89e222b 100644
--- a/components/startup_metric_utils/browser/startup_metric_utils.cc
+++ b/components/startup_metric_utils/browser/startup_metric_utils.cc
@@ -39,7 +39,7 @@ namespace {
 
 // Mark as volatile to defensively make sure usage is thread-safe.
 // Note that at the time of this writing, access is only on the UI thread.
-volatile bool g_non_browser_ui_displayed = false;
+volatile bool g_main_window_startup_interrupted = false;
 
 base::LazyInstance<base::TimeTicks>::Leaky g_process_creation_ticks =
     LAZY_INSTANCE_INITIALIZER;
@@ -557,12 +557,16 @@ void RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterIntegerPref(prefs::kSameVersionStartupCount, 0);
 }
 
-bool WasNonBrowserUIDisplayed() {
-  return g_non_browser_ui_displayed;
+bool WasMainWindowStartupInterrupted() {
+  return g_main_window_startup_interrupted;
 }
 
 void SetNonBrowserUIDisplayed() {
-  g_non_browser_ui_displayed = true;
+  g_main_window_startup_interrupted = true;
+}
+
+void SetBackgroundModeEnabled() {
+  g_main_window_startup_interrupted = true;
 }
 
 void RecordStartupProcessCreationTime(const base::Time& time) {
@@ -662,7 +666,8 @@ void RecordBrowserWindowDisplay(const base::TimeTicks& ticks) {
   if (!is_first_call || ticks.is_null())
     return;
   is_first_call = false;
-  if (WasNonBrowserUIDisplayed() || g_process_creation_ticks.Get().is_null())
+  if (WasMainWindowStartupInterrupted() ||
+      g_process_creation_ticks.Get().is_null())
     return;
 
   UMA_HISTOGRAM_AND_TRACE_WITH_TEMPERATURE_AND_SAME_VERSION_COUNT(
@@ -692,7 +697,8 @@ void RecordFirstWebContentsMainFrameLoad(const base::TimeTicks& ticks) {
   if (!is_first_call || ticks.is_null())
     return;
   is_first_call = false;
-  if (WasNonBrowserUIDisplayed() || g_process_creation_ticks.Get().is_null())
+  if (WasMainWindowStartupInterrupted() ||
+      g_process_creation_ticks.Get().is_null())
     return;
 
   UMA_HISTOGRAM_AND_TRACE_WITH_TEMPERATURE_AND_SAME_VERSION_COUNT(
@@ -710,7 +716,8 @@ void RecordFirstWebContentsNonEmptyPaint(const base::TimeTicks& ticks) {
   // entry time and the startup temperature are known.
   RecordRendererMainEntryHistogram();
 
-  if (WasNonBrowserUIDisplayed() || g_process_creation_ticks.Get().is_null())
+  if (WasMainWindowStartupInterrupted() ||
+      g_process_creation_ticks.Get().is_null())
     return;
 
   base::StackSamplingProfiler::SetProcessMilestone(
@@ -726,7 +733,8 @@ void RecordFirstWebContentsMainNavigationStart(const base::TimeTicks& ticks,
   if (!is_first_call || ticks.is_null())
     return;
   is_first_call = false;
-  if (WasNonBrowserUIDisplayed() || g_process_creation_ticks.Get().is_null())
+  if (WasMainWindowStartupInterrupted() ||
+      g_process_creation_ticks.Get().is_null())
     return;
 
   base::StackSamplingProfiler::SetProcessMilestone(
@@ -758,7 +766,8 @@ void RecordFirstWebContentsMainNavigationFinished(
   if (!is_first_call || ticks.is_null())
     return;
   is_first_call = false;
-  if (WasNonBrowserUIDisplayed() || g_process_creation_ticks.Get().is_null())
+  if (WasMainWindowStartupInterrupted() ||
+      g_process_creation_ticks.Get().is_null())
     return;
 
   base::StackSamplingProfiler::SetProcessMilestone(
@@ -769,6 +778,35 @@ void RecordFirstWebContentsMainNavigationFinished(
       g_process_creation_ticks.Get(), ticks);
 }
 
+void RecordBrowserViewFirstPaint(const base::TimeTicks& ticks) {
+  static bool is_first_call = true;
+  if (!is_first_call || ticks.is_null())
+    return;
+  is_first_call = false;
+  if (WasMainWindowStartupInterrupted() ||
+      g_process_creation_ticks.Get().is_null())
+    return;
+
+  UMA_HISTOGRAM_AND_TRACE_WITH_TEMPERATURE(
+      UMA_HISTOGRAM_LONG_TIMES_100, "Startup.BrowserView.FirstPaint",
+      ticks - g_process_creation_ticks.Get());
+}
+
+void RecordBrowserViewFirstPaintCompositingEnded(const base::TimeTicks& ticks) {
+  static bool is_first_call = true;
+  if (!is_first_call || ticks.is_null())
+    return;
+  is_first_call = false;
+  if (WasMainWindowStartupInterrupted() ||
+      g_process_creation_ticks.Get().is_null())
+    return;
+
+  UMA_HISTOGRAM_AND_TRACE_WITH_TEMPERATURE(
+      UMA_HISTOGRAM_LONG_TIMES_100,
+      "Startup.BrowserView.FirstPaint.CompositingEnded",
+      g_process_creation_ticks.Get(), ticks);
+}
+
 base::TimeTicks MainEntryPointTicks() {
   return g_browser_main_entry_point_ticks.Get();
 }