Replace image_messages.h with Mojo service

content/renderer/image_downloader/image_downloader_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 CONTENT_IMAGE_DOWNLOADER_IMPL_H_
+#define CONTENT_IMAGE_DOWNLOADER_IMPL_H_
+
+#include <vector>
+
+#include "base/memory/scoped_vector.h"
+#include "content/common/image_downloader/image_downloader.mojom.h"
+#include "content/public/renderer/render_frame_observer.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
+#include "url/gurl.h"
+
+class SkBitmap;
+
+namespace gfx {
+class Size;
+}
+
+namespace content {
+
+class MultiResolutionImageResourceFetcher;
+class RenderFrame;
+
+class ImageDownloaderImpl : public image_downloader::ImageDownloader,
+                            public RenderFrameObserver {
+ public:
+  static void CreateMojoService(
+      RenderFrame* render_frame,
+      mojo::InterfaceRequest<image_downloader::ImageDownloader> request);
+
+ private:
+  explicit ImageDownloaderImpl(
+      RenderFrame* render_frame,
+      mojo::InterfaceRequest<image_downloader::ImageDownloader> request);
+  ~ImageDownloaderImpl() override;
+
+  // ImageDownloader methods:
+  void DownloadImage(image_downloader::DownloadRequestPtr req,
+                     const DownloadImageCallback& callback) override;
+
+  // Requests to fetch an image. When done, the ImageDownloaderImpl
+  // is notified by way of DidFetchImage. Returns true if the
+  // request was successfully started, false otherwise.
+  // If the image is a favicon, cookies will not be
+  // sent nor accepted during download. If the image has multiple frames, all
+  // the frames whose size <= |max_image_size| are returned. If all of the
+  // frames are larger than |max_image_size|, the smallest frame is resized to
+  // |max_image_size| and is the only result. |max_image_size| == 0 is
+  // interpreted as no max image size.
+  bool FetchImage(const GURL& image_url,
+                  bool is_favicon,
+                  uint32_t max_image_size,
+                  bool bypass_cache,
+                  const DownloadImageCallback& callback);
+
+  // This callback is triggered when FetchImage completes, either
+  // succesfully or with a failure. See FetchImage for more
+  // details.
+  void DidFetchImage(uint32_t max_image_size,
+                     const DownloadImageCallback& callback,
+                     MultiResolutionImageResourceFetcher* fetcher,
+                     const std::vector<SkBitmap>& images);
+
+  // Decodes a data: URL image or returns an empty image in case of failure.
+  SkBitmap ImageFromDataUrl(const GURL&) const;
+
+  // Reply download result
+  void ReplyDownloadResult(
+      int32_t http_status_code,
+      const std::vector<SkBitmap>& result_images,
+      const std::vector<gfx::Size>& result_original_image_sizes,
+      const DownloadImageCallback& callback);
+
+  // We use StrongBinding to ensure deletion of "this" when connection closed
+  mojo::StrongBinding<ImageDownloader> binding_;
+
+  typedef ScopedVector<MultiResolutionImageResourceFetcher>
+      ImageResourceFetcherList;
+
+  // ImageResourceFetchers schedule via FetchImage.
+  ImageResourceFetcherList image_fetchers_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageDownloaderImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_IMAGE_DOWNLOADER_IMPL_H_