[Android] Support startup histogram.

chrome/common/startup_metric_utils.cc

Index: chrome/common/startup_metric_utils.cc
diff --git a/chrome/common/startup_metric_utils.cc b/chrome/common/startup_metric_utils.cc
index 3d576e9f402820dd0adfe68f4d0f2a5f7da9ce58..bd57854c4f83768081ff51a7f07855f2b602913b 100644
--- a/chrome/common/startup_metric_utils.cc
+++ b/chrome/common/startup_metric_utils.cc
@@ -19,7 +19,7 @@ namespace {
 // Note that at the time of this writing, access is only on the UI thread.
 volatile bool g_non_browser_ui_displayed = false;
 
-const base::Time* MainEntryPointTimeInternal() {
+base::Time* MainEntryPointTimeInternal() {
   static base::Time main_start_time = base::Time::Now();
   return &main_start_time;
 }
@@ -56,7 +56,13 @@ void SetNonBrowserUIDisplayed() {
 void RecordMainEntryPointTime() {
   DCHECK(!g_main_entry_time_was_recorded);
   g_main_entry_time_was_recorded = true;
-  MainEntryPointTimeInternal();
+  *MainEntryPointTimeInternal() = base::Time::Now();

[jeremy, 2013/08/27 19:18:51]

Sorry, I don't understand this change?

[aberent, 2013/08/28 15:53:05]

Done. You are right, it isn't needed.

+}
+
+void RecordSavedMainEntryPointTime(const base::Time& entry_point_time) {

[jeremy, 2013/08/27 19:18:51]

Again

#if defined(OS_ANDROID)

[aberent, 2013/08/28 15:53:05]

Done.

+  DCHECK(!g_main_entry_time_was_recorded);
+  g_main_entry_time_was_recorded = true;
+  *MainEntryPointTimeInternal() = entry_point_time;
 }
 
 // Return the time recorded by RecordMainEntryPointTime().