Add Quota.TimeSinceOriginEvicted UMA histogram.

storage/browser/quota/quota_database.h

 // 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.
 
 #ifndef STORAGE_BROWSER_QUOTA_QUOTA_DATABASE_H_
 #define STORAGE_BROWSER_QUOTA_QUOTA_DATABASE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 40 matching lines @@
   bool DeleteHostQuota(const std::string& host, StorageType type);
 
   bool SetOriginLastAccessTime(const GURL& origin,
                                StorageType type,
                                base::Time last_access_time);
 
   bool SetOriginLastModifiedTime(const GURL& origin,
                                  StorageType type,
                                  base::Time last_modified_time);
 
+  bool GetOriginLastEvictionTime(const GURL& origin,
+                                 StorageType type,
+                                 base::Time* last_eviction_time);
+  bool SetOriginLastEvictionTime(const GURL& origin,
+                                 StorageType type,
+                                 base::Time last_eviction_time);
+  bool DeleteOriginLastEvictionTime(const GURL& origin, StorageType type);
+
   // Register initial |origins| info |type| to the database.
   // This method is assumed to be called only after the installation or
   // the database schema reset.
   bool RegisterInitialOriginInfo(
       const std::set<GURL>& origins, StorageType type);
 
   bool DeleteOriginInfo(const GURL& origin, StorageType type);
 
   bool GetQuotaConfigValue(const char* key, int64* value);
   bool SetQuotaConfigValue(const char* key, int64 value);
@@ skipping 109 matching lines @@
 
   static const TableSchema kTables[];
   static const IndexSchema kIndexes[];
 
   DISALLOW_COPY_AND_ASSIGN(QuotaDatabase);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_QUOTA_QUOTA_DATABASE_H_