Turn the utility process image decoder into a Mojo service.

components/image_decoder/image_decoder_impl.h

+// Copyright 2015 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 COMPONENTS_IMAGE_DECODER_IMAGE_DECODER_IMPL_H_
+#define COMPONENTS_IMAGE_DECODER_IMAGE_DECODER_IMPL_H_
+
+#include "base/macros.h"
+#include "components/image_decoder/public/interfaces/image_decoder.mojom.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
+
+namespace image_decoder {
+
+class ImageDecoderImpl : public ImageDecoder {
+ public:
+  explicit ImageDecoderImpl(int64_t max_message_size);
+  explicit ImageDecoderImpl(mojo::InterfaceRequest<ImageDecoder> request);
+  ~ImageDecoderImpl() override;
+
+  // Public for testing.
+  // Overridden from image_decoder::ImageDecoder:
+  void DecodeImage(
+      mojo::Array<uint8_t> encoded_data,
+      ImageCodec codec,
+      bool shrink_to_fit,
+      const mojo::Callback<void(skia::BitmapPtr)>& callback) override;
+
+ private:
+  int64_t max_message_size_;
+  mojo::StrongBinding<ImageDecoder> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageDecoderImpl);
+};
+
+}  // namespace image_decoder
+
+#endif  // COMPONENTS_IMAGE_DECODER_IMAGE_DECODER_IMPL_H_