Encrypted Media: Implement IPC based SetCdm().

content/renderer/media/android/renderer_media_player_manager.h

Index: content/renderer/media/android/renderer_media_player_manager.h
diff --git a/content/renderer/media/android/renderer_media_player_manager.h b/content/renderer/media/android/renderer_media_player_manager.h
index 0c775f8f65e1f3df497482cae2906bcf9e241df3..162cf338ae7dc89825df351812c2aa7be31459fd 100644
--- a/content/renderer/media/android/renderer_media_player_manager.h
+++ b/content/renderer/media/android/renderer_media_player_manager.h
@@ -80,6 +80,9 @@ class RendererMediaPlayerManager : public RenderViewObserver {
   // Requests the player to exit fullscreen.
   void ExitFullscreen(int player_id);
 
+  // Requests the player with |player_id| to use the CDM with |cdm_id|.
+  void SetMediaKeys(int player_id, int cdm_id);
+
 #if defined(VIDEO_HOLE)
   // Requests an external surface for out-of-band compositing.
   void RequestExternalSurface(int player_id, const gfx::RectF& geometry);