Turn the utility process image decoder into a Mojo service.

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 2206dd9f454ebcbfc3a29674cf41e1d42eb594ee..2f09263cdb3ac7dcbc14e041b39b03dfac432dcd 100644
--- a/chrome/browser/image_decoder.h
+++ b/chrome/browser/image_decoder.h
@@ -12,6 +12,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "content/public/browser/utility_process_host_client.h"
+#include "services/image_decoder/public/interfaces/image_decoder.mojom.h"
 
 class SkBitmap;
 
@@ -72,11 +73,15 @@ class ImageDecoder : public content::UtilityProcessHostClient {
   // Launches sandboxed process that will decode the image.
   void DecodeImageInSandbox(const std::vector<unsigned char>& image_data);
 
+  // Mojo RPC callback.
+  void OnDecodeImageDone(bool success, skia::ImagePtr image);
+
   Delegate* delegate_;
   std::vector<unsigned char> image_data_;
   const ImageCodec image_codec_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  bool shrink_to_fit_; // if needed for IPC msg size limit
+  bool shrink_to_fit_;  // if needed for IPC msg size limit
+  services::image_decoder::ImageDecoderPtr decoder_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
 };