Add UMA data for memory pressure warning received for sync

components/sync_driver/sync_prefs.h

Index: components/sync_driver/sync_prefs.h
diff --git a/components/sync_driver/sync_prefs.h b/components/sync_driver/sync_prefs.h
index 23109467a46dc4be4d3a20a9a7934279c50cab2e..b7266b47d5862f423cf5614cedeec9fb45fd077b 100644
--- a/components/sync_driver/sync_prefs.h
+++ b/components/sync_driver/sync_prefs.h
@@ -140,6 +140,11 @@ class SyncPrefs : NON_EXPORTED_BASE(public base::NonThreadSafe),
   // For testing.
   void SetManagedForTest(bool is_managed);
 
+  int GetMemoryPressure() const;

[stanisc, 2015/05/15 20:31:04]

Need comments for all 4 functions

[Gang Wu, 2015/05/15 21:13:47]

Done.

+  void SetMemoryPressure(int value);
+  bool IsPreviousCrashed() const;

[stanisc, 2015/05/15 20:31:04]

These two function names are confusing. Basically they are supposed to tell
whether the last shutdown was successful. The names should reflect that clearly.

+  void SetCurrentShutdown(bool value);
+
  private:
   void RegisterPrefGroups();