Add Quota.TimeSinceOriginEvicted UMA histogram.

storage/browser/quota/quota_manager.h

Index: storage/browser/quota/quota_manager.h
diff --git a/storage/browser/quota/quota_manager.h b/storage/browser/quota/quota_manager.h
index 3e053887b1ff41fb41810af6b5bfa9f134f6aa3d..860d08316439d31b409b8a8eb6e4304177b2fe4d 100644
--- a/storage/browser/quota/quota_manager.h
+++ b/storage/browser/quota/quota_manager.h
@@ -266,6 +266,8 @@ class STORAGE_EXPORT QuotaManager
 
   static const int kEvictionIntervalInMilliSeconds;
 
+  static const char kTimeBetweenOriginEvictionsHistogram[];
+
   // These are kept non-const so that test code can change the value.
   // TODO(kinuko): Make this a real const value and add a proper way to set
   // the quota for syncable storage. (http://crbug.com/155488)
@@ -361,9 +363,17 @@ class STORAGE_EXPORT QuotaManager
   void DumpQuotaTable(const DumpQuotaTableCallback& callback);
   void DumpOriginInfoTable(const DumpOriginInfoTableCallback& callback);
 
+  void DeleteOriginDataInternal(const GURL& origin,
+                                StorageType type,
+                                int quota_client_mask,
+                                bool is_eviction,
+                                const StatusCallback& callback);
+
   // Methods for eviction logic.
   void StartEviction();
-  void DeleteOriginFromDatabase(const GURL& origin, StorageType type);
+  void DeleteOriginFromDatabase(const GURL& origin,
+                                StorageType type,
+                                bool is_eviction);
 
   void DidOriginDataEvicted(QuotaStatusCode status);