Media Remoting: Draw remoting interstitial on poster image.

media/remoting/remoting_renderer_controller.h

Index: media/remoting/remoting_renderer_controller.h
diff --git a/media/remoting/remoting_renderer_controller.h b/media/remoting/remoting_renderer_controller.h
index 9c98af12b555441c1ade86ff34291b321c7a8076..bf235f3266df84006602d3107aabc900fec407b3 100644
--- a/media/remoting/remoting_renderer_controller.h
+++ b/media/remoting/remoting_renderer_controller.h
@@ -9,6 +9,7 @@
 #include "base/memory/weak_ptr.h"
 #include "media/base/media_observer.h"
 #include "media/remoting/remoting_source_impl.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 
 namespace media {
 
@@ -37,9 +38,27 @@ class RemotingRendererController final : public RemotingSourceImpl::Client,
   void OnExitedFullscreen() override;
   void OnSetCdm(CdmContext* cdm_context) override;
   void OnMetadataChanged(const PipelineMetadata& metadata) override;
+  void OnSetPoster(const GURL& poster) override;
 
   void SetSwitchRendererCallback(const base::Closure& cb);
 
+  using DownloadPosterCallback =
+      base::Callback<void(const GURL&,
+                          const base::Callback<void(const SkBitmap&)>&)>;
+  // Set the callback to download poster image. Can only be called once.
+  void SetDownloadPosterCallback(const DownloadPosterCallback& cb);
+
+  // Download the poster image if available, and show remoting interstitial.
+  // Called when the poster URL is changed (to update the background image).
+  // TODO(xjz): https://codereview.chromium.org/2566223005/
+  // Call this when:
+  // 1. SetShowInterstitialCallback() is called (RemoteRendererImpl is created).
+  // 2. The remoting session is shut down (to update the status message in the
+  //    interstitial).
+  // 3. The size of the canvas is changed (to update the background image and
+  //    the position of the status message).
+  void UpdateAndMaybeShowInterstitial();
+
   base::WeakPtr<RemotingRendererController> GetWeakPtr() {
     return weak_factory_.GetWeakPtr();
   }
@@ -90,6 +109,9 @@ class RemotingRendererController final : public RemotingSourceImpl::Client,
   // necessary.
   void UpdateAndMaybeSwitch();
 
+  // Called when poster image is downloaded.
+  void PosterImageDownloaded(const SkBitmap& image);
+
   // Indicates whether this media element or its ancestor is in full screen.
   bool is_fullscreen_ = false;
 
@@ -116,6 +138,10 @@ class RemotingRendererController final : public RemotingSourceImpl::Client,
 
   PipelineMetadata pipeline_metadata_;
 
+  GURL poster_url_;
+
+  DownloadPosterCallback download_poster_cb_;
+
   base::WeakPtrFactory<RemotingRendererController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemotingRendererController);