Implement video renderer based on VideoDecode API.

remoting/client/plugin/pepper_video_renderer.h

Index: remoting/client/plugin/pepper_video_renderer.h
diff --git a/remoting/client/plugin/pepper_video_renderer.h b/remoting/client/plugin/pepper_video_renderer.h
index e604986d49bdd72ef4ff64d34c5d0c4979fd3d71..b9192360c17b6ad2ab84479a04c692b8e23dcd4b 100644
--- a/remoting/client/plugin/pepper_video_renderer.h
+++ b/remoting/client/plugin/pepper_video_renderer.h
@@ -13,6 +13,11 @@ class DesktopVector;
 class DesktopRegion;
 }  // namespace webrtc
 
+namespace pp {
+class Instance;
+class View;
+}  // namespace pp
+
 namespace remoting {
 
 class ClientContext;
@@ -25,6 +30,9 @@ class PepperVideoRenderer : public VideoRenderer {
     EventHandler() {}
     virtual ~EventHandler() {}
 
+    // Called if video decoding fails, for any reason.
+    virtual void OnVideoDecodeError() = 0;
+
     // Called when the first frame is received.
     virtual void OnVideoFirstFrameReceived() = 0;