Media Remoting: Draw remoting interstitial on poster image.

content/renderer/image_downloader/single_image_downloader.cc

+// 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.
+
+#include "content/renderer/image_downloader/single_image_downloader.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+
+namespace content {
+
+// Static
+void SingleImageDownloader::DownloadImage(RenderFrame* render_frame,
+                                          const GURL& url,
+                                          const DownloadImageCallback& cb) {
+  DCHECK(!cb.is_null());
+  DCHECK(render_frame);

[miu, 2016/12/20 00:48:06]

See comment in header file (re: using WeakPtr instead). This would become:

  if (!render_frame) {
    cb.Run(SkBitmap());
    return;
  }

[xjz, 2016/12/20 21:46:25]

Done.

+
+  std::unique_ptr<ImageDownloaderBase> image_downloader(
+      new ImageDownloaderBase(render_frame));
+  ImageDownloaderBase* image_downloader_ptr = image_downloader.get();
+  image_downloader_ptr->DownloadImage(
+      url, false, false, base::Bind(&SingleImageDownloader::DidDownloadImage,
+                                    base::Passed(&image_downloader), cb));
+}
+
+// Static
+void SingleImageDownloader::DidDownloadImage(
+    std::unique_ptr<ImageDownloaderBase> image_downloader,
+    const DownloadImageCallback& callback,
+    int http_status_code,
+    const std::vector<SkBitmap>& images) {
+  DCHECK(!callback.is_null());
+  callback.Run(images.empty() ? SkBitmap() : images[0]);
+}
+
+}  // namespace content