Add Startup.BrowserMessageLoopStart.To.NonEmptyPaint2 metric.

components/startup_metric_utils/browser/startup_metric_utils.cc

 // Copyright 2013 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 "components/startup_metric_utils/browser/startup_metric_utils.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
@@ skipping 35 matching lines @@
 
 base::LazyInstance<base::TimeTicks>::Leaky g_browser_main_entry_point_ticks =
     LAZY_INSTANCE_INITIALIZER;
 
 base::LazyInstance<base::TimeTicks>::Leaky g_renderer_main_entry_point_ticks =
     LAZY_INSTANCE_INITIALIZER;
 
 base::LazyInstance<base::TimeTicks>::Leaky
     g_browser_exe_main_entry_point_ticks = LAZY_INSTANCE_INITIALIZER;
 
+base::LazyInstance<base::TimeTicks>::Leaky g_message_loop_start_ticks =
+    LAZY_INSTANCE_INITIALIZER;
+
 // Only used by RecordMainEntryTimeHistogram(), should go away with it (do not
 // add new uses of this), see crbug.com/317481 for discussion on why it was kept
 // as-is for now.
 base::LazyInstance<base::Time>::Leaky g_browser_main_entry_point_time =
     LAZY_INSTANCE_INITIALIZER;
 
 // An enumeration of startup temperatures. This must be kept in sync with the
 // UMA StartupType enumeration defined in histograms.xml.
 enum StartupTemperature {
   // The startup was a cold start: nearly all of the binaries and resources were
@@ skipping 525 matching lines @@
   g_browser_main_entry_point_time.Get() = time;
   DCHECK(!g_browser_main_entry_point_time.Get().is_null());
 }
 
 void RecordExeMainEntryPointTicks(base::TimeTicks ticks) {
   DCHECK(g_browser_exe_main_entry_point_ticks.Get().is_null());
   g_browser_exe_main_entry_point_ticks.Get() = ticks;
   DCHECK(!g_browser_exe_main_entry_point_ticks.Get().is_null());
 }
 
+void RecordMessageLoopStartTicks(base::TimeTicks ticks) {
+  DCHECK(g_message_loop_start_ticks.Get().is_null());
+  g_message_loop_start_ticks.Get() = ticks;
+  DCHECK(!g_message_loop_start_ticks.Get().is_null());
+}
+
 void RecordBrowserMainMessageLoopStart(base::TimeTicks ticks,
                                        bool is_first_run,
                                        PrefService* pref_service) {
   DCHECK(pref_service);
+  RecordMessageLoopStartTicks(ticks);
 
   // Keep RecordSameVersionStartupCount() and RecordHardFaultHistogram()
   // near the top of this method (as much as possible) as many other
   // histograms depend on it setting |g_startup_temperature| and
   // |g_startups_with_current_version|.
   RecordSameVersionStartupCount(pref_service);
   RecordHardFaultHistogram();
 
   // Record timing of the browser message-loop start time.
   base::StackSamplingProfiler::SetProcessMilestone(
@@ skipping 104 matching lines @@
   RecordRendererMainEntryHistogram();
 
   if (!ShouldLogStartupHistogram())
     return;
 
   base::StackSamplingProfiler::SetProcessMilestone(
       metrics::CallStackProfileMetricsProvider::FIRST_NONEMPTY_PAINT);
   UMA_HISTOGRAM_AND_TRACE_WITH_TEMPERATURE_AND_SAME_VERSION_COUNT(
       UMA_HISTOGRAM_LONG_TIMES_100, "Startup.FirstWebContents.NonEmptyPaint2",
       g_process_creation_ticks.Get(), ticks);
+  UMA_HISTOGRAM_WITH_TEMPERATURE(
+      UMA_HISTOGRAM_LONG_TIMES_100,
+      "Startup.BrowserMessageLoopStart.To.NonEmptyPaint2",
+      ticks - g_message_loop_start_ticks.Get());
 }
 
 void RecordFirstWebContentsMainNavigationStart(base::TimeTicks ticks,
                                                WebContentsWorkload workload) {
   static bool is_first_call = true;
   if (!is_first_call || ticks.is_null())
     return;
   is_first_call = false;
   if (!ShouldLogStartupHistogram())
     return;
 
   base::StackSamplingProfiler::SetProcessMilestone(
       metrics::CallStackProfileMetricsProvider::MAIN_NAVIGATION_START);
   UMA_HISTOGRAM_AND_TRACE_WITH_TEMPERATURE_AND_SAME_VERSION_COUNT(
       UMA_HISTOGRAM_LONG_TIMES_100,
       "Startup.FirstWebContents.MainNavigationStart",
       g_process_creation_ticks.Get(), ticks);
+  UMA_HISTOGRAM_WITH_TEMPERATURE(
+      UMA_HISTOGRAM_LONG_TIMES_100,
+      "Startup.BrowserMessageLoopStart.To.MainNavigationStart",
+      ticks - g_message_loop_start_ticks.Get());
 
   // Log extra information about this startup's workload. Only added to this
   // histogram as this extra suffix can help making it less noisy but isn't
   // worth tripling the number of startup histograms either.
   if (workload == WebContentsWorkload::SINGLE_TAB) {
     UMA_HISTOGRAM_WITH_TEMPERATURE(
         UMA_HISTOGRAM_LONG_TIMES_100,
         "Startup.FirstWebContents.MainNavigationStart.SingleTab",
         ticks - g_process_creation_ticks.Get());
   } else {
@@ skipping 46 matching lines @@
       UMA_HISTOGRAM_LONG_TIMES_100,
       "Startup.BrowserWindow.FirstPaint.CompositingEnded",
       g_process_creation_ticks.Get(), ticks);
 }
 
 base::TimeTicks MainEntryPointTicks() {
   return g_browser_main_entry_point_ticks.Get();
 }
 
 }  // namespace startup_metric_utils