Replace the RepeatingTimer in ImageDecoder with a DelayTimer.

chrome/browser/image_decoder.h

 // Copyright (c) 2012 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 CHROME_BROWSER_IMAGE_DECODER_H_
 #define CHROME_BROWSER_IMAGE_DECODER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 123 matching lines @@
 
   // Map of request id's to ImageRequests.
   RequestMap image_request_id_map_;
 
   // Protects |image_request_id_map_| and |image_request_id_counter_|.
   base::Lock map_lock_;
 
   // The UtilityProcessHost requests are sent to.
   base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
 
   // Calls StopBatchMode() after |kBatchModeTimeoutSeconds| have elapsed.

[Anand Mistry (off Chromium), 2015/04/30 06:14:43]

nit: ...since the last decoding request was started.

or some other similar wording.

-  base::RepeatingTimer<ImageDecoder> batch_mode_timer_;
-
-  // The time Start() was last called.
-  base::TimeTicks last_request_;
+  scoped_ptr<base::DelayTimer<ImageDecoder>> batch_mode_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
 };
 
 #endif  // CHROME_BROWSER_IMAGE_DECODER_H_