Turn 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 <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/timer/timer.h"
 #include "content/public/browser/utility_process_host.h"
 #include "content/public/browser/utility_process_host_client.h"
+#include "services/image_decoder/public/interfaces/image_decoder.mojom.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
 // the callback (ImageRequest::OnImageDecoded or
 // ImageRequest::OnDecodeImageFailed) is posted back to the |task_runner_|
@@ skipping 88 matching lines @@
 
   // Overidden from UtilityProcessHostClient.
   void OnProcessCrashed(int exit_code) override;
   void OnProcessLaunchFailed() override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // IPC message handlers.
   void OnDecodeImageSucceeded(const SkBitmap& decoded_image, int request_id);
   void OnDecodeImageFailed(int request_id);
 
+  // Mojo IPC callback.
+  void OnDecodeImageDone(int request_id, skia::BitmapPtr image);
+
   // Removes the job from the map of requests.
   void RemoveJob(const scoped_refptr<Job>& job);
 
   // id to use for the next Start request that comes in.
   int image_request_id_counter_;
 
   // 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.
   base::RepeatingTimer<ImageDecoder> batch_mode_timer_;
 
   // The time Start was last called.
   base::TimeTicks last_request_;
 
+  // Mojo service connection. Must always be bound/reset and used on the IO
+  // thread.
+  services::ImageDecoderPtr decoder_;
+
   DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
 };
 
 #endif  // CHROME_BROWSER_IMAGE_DECODER_H_