Media Remoting: Draw remoting interstitial on poster image.

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_RENDERER_IMAGE_DOWNLOADER_IMAGE_DOWNLOADER_IMPL_H_
 #define CONTENT_RENDERER_IMAGE_DOWNLOADER_IMAGE_DOWNLOADER_IMPL_H_
 
 #include <stdint.h>
 
 #include <vector>
 
-#include "base/macros.h"
-#include "base/memory/scoped_vector.h"
 #include "content/common/image_downloader/image_downloader.mojom.h"
 #include "content/public/renderer/render_frame_observer.h"
-#include "content/public/renderer/render_thread_observer.h"
+#include "content/renderer/image_downloader/image_downloader_core.h"
 #include "mojo/public/cpp/bindings/binding.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "url/gurl.h"
 
-class SkBitmap;
-
-namespace gfx {
-class Size;
-}
-
 namespace content {
 
-class MultiResolutionImageResourceFetcher;
+class ImageDownloaderCore;
 class RenderFrame;
 
 class ImageDownloaderImpl : public mojom::ImageDownloader,
-                            public RenderFrameObserver,
-                            public RenderThreadObserver {
+                            public RenderFrameObserver {
  public:
   ~ImageDownloaderImpl() override;
 
   static void CreateMojoService(RenderFrame* render_frame,
                                 mojom::ImageDownloaderRequest request);
 
-  // RenderThreadObserver implementation.
-  void OnRenderProcessShutdown() override;
-
  private:
   ImageDownloaderImpl(RenderFrame* render_frame,
                       mojom::ImageDownloaderRequest request);
 
   // RenderFrameObserver implementation.
   void OnDestruct() override;
 
-  // ImageDownloader methods:
+  // ImageDownloader implementation.
   void DownloadImage(const GURL& url,
                      bool is_favicon,
                      uint32_t max_bitmap_size,
                      bool bypass_cache,
                      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
+  // Called when downloading finishes. All frames in |images| whose size <=
+  // |max_image_size| will be returned through |callback|. 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);
-
-  // 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);
-
-  typedef ScopedVector<MultiResolutionImageResourceFetcher>
-      ImageResourceFetcherList;
-
-  // ImageResourceFetchers schedule via FetchImage.
-  ImageResourceFetcherList image_fetchers_;
+  void DidDownloadImage(uint32_t max_bitmap_size,
+                        const DownloadImageCallback& callback,
+                        int32_t http_status_code,
+                        const std::vector<SkBitmap>& images);
 
   mojo::Binding<mojom::ImageDownloader> binding_;
 
+  ImageDownloaderCore image_downloader_;

[miu, 2016/12/03 01:05:30]

If the core installs a RenderFrameObserver (see other comment), then perhaps
this Impl class should subclass the Core class instead, and override
OnDestruct() to "delete this":

  void OnDestruct() {
    ImageDownloaderCore::OnDestruct();
    delete this;
  }

[xjz, 2016/12/06 19:50:55]

Changed to use inheritance and "delete this" in base class when RenderFrame is
gone.

[xjz, 2016/12/06 23:58:17]

As commented elsewhere, removed "delete this" in base class. And override
OnDestruct() here, and "delete this". Didn't call
ImageDownloaderBase::OnDestruct() though. Is it necessary since the RenderFrame
is already destructed?

+
   DISALLOW_COPY_AND_ASSIGN(ImageDownloaderImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_IMAGE_DOWNLOADER_IMAGE_DOWNLOADER_IMPL_H_