Replace the RepeatingTimer in ImageDecoder with a DelayTimer.

chrome/browser/image_decoder.h

Index: chrome/browser/image_decoder.h
diff --git a/chrome/browser/image_decoder.h b/chrome/browser/image_decoder.h
index ca7604350e97ea63b229a339666faa49bd1a6002..657f61a4f210db28c86af42b82cdf6b134b2058b 100644
--- a/chrome/browser/image_decoder.h
+++ b/chrome/browser/image_decoder.h
@@ -142,10 +142,7 @@ class ImageDecoder : public content::UtilityProcessHostClient {
   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);
 };