Convert the utility process image decoder into a Mojo service.

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 <memory>
 #include <string>
 #include <vector>
 
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequence_checker.h"
 #include "base/sequenced_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "base/timer/timer.h"
 #include "build/build_config.h"
+#include "chrome/common/image_decoder.mojom.h"
 #include "content/public/browser/utility_process_host.h"
 #include "content/public/browser/utility_process_host_client.h"
 
 class SkBitmap;
 
 // This is a helper class for decoding images safely in a utility process. To
 // use this, call ImageDecoder::Start(...) or
 // ImageDecoder::StartWithOptions(...) on any thread.
 //
 // Internally, most of the work happens on the IO thread, and then
@@ skipping 116 matching lines @@
   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,
   // unless a new decoding request resets the timer.
-  scoped_ptr<base::DelayTimer> batch_mode_timer_;
+  std::unique_ptr<base::DelayTimer> batch_mode_timer_;
+
+  // Mojo service connection. Must always be bound/reset and used on the IO
+  // thread.
+  mojom::ImageDecoderPtr decoder_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
 };
 
 #endif  // CHROME_BROWSER_IMAGE_DECODER_H_