[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..681b70424ad809c902af1010808b8cf58b22fcd4 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;
 }
@@ -59,6 +59,14 @@ void RecordMainEntryPointTime() {
   MainEntryPointTimeInternal();
 }
 
+#if defined(OS_ANDROID)
+void RecordSavedMainEntryPointTime(const base::Time& entry_point_time) {
+  DCHECK(!g_main_entry_time_was_recorded);
+  g_main_entry_time_was_recorded = true;
+  *MainEntryPointTimeInternal() = entry_point_time;
+}
+#endif // OS_ANDROID
+
 // Return the time recorded by RecordMainEntryPointTime().
 const base::Time MainEntryStartTime() {
   DCHECK(g_main_entry_time_was_recorded);