[RemotePlayback] Keep track of source compatibility and reject prompt() correspondingly

third_party/WebKit/Source/core/html/HTMLMediaElement.h

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.h b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
index 7e93de204668e5ba00636fb503c02f15fae9a430..68c5c311b44125e2296c464f5ab20e112120bbc2 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.h
@@ -117,7 +117,7 @@ class CORE_EXPORT HTMLMediaElement : public HTMLElement,
   };
   void scheduleTextTrackResourceLoad();
 
-  bool hasRemoteRoutes() const { return m_remoteRoutesAvailable; }
+  bool hasRemoteRoutes() const;
   bool isPlayingRemotely() const { return m_playingRemotely; }
 
   // error state
@@ -308,6 +308,9 @@ class CORE_EXPORT HTMLMediaElement : public HTMLElement,
   WebRemotePlaybackClient* remotePlaybackClient() {
     return m_remotePlaybackClient;
   }
+  const WebRemotePlaybackClient* remotePlaybackClient() const {
+    return m_remotePlaybackClient;
+  }
 
  protected:
   HTMLMediaElement(const QualifiedName&, Document&);
@@ -386,7 +389,7 @@ class CORE_EXPORT HTMLMediaElement : public HTMLElement,
   void removeTextTrack(WebInbandTextTrack*) final;
   void mediaSourceOpened(WebMediaSource*) final;
   void requestSeek(double) final;
-  void remoteRouteAvailabilityChanged(bool) final;
+  void remoteRouteAvailabilityChanged(WebRemotePlaybackAvailability) final;
   void connectedToRemoteDevice() final;
   void disconnectedFromRemoteDevice() final;
   void cancelledRemotePlaybackRequest() final;
@@ -641,7 +644,6 @@ class CORE_EXPORT HTMLMediaElement : public HTMLElement,
 
   bool m_tracksAreReady : 1;
   bool m_processingPreferenceChange : 1;
-  bool m_remoteRoutesAvailable : 1;
   bool m_playingRemotely : 1;
   // Whether this element is in overlay fullscreen mode.
   bool m_inOverlayFullscreenVideo : 1;