Plumb callbacks from mojo media service to client.

media/mojo/clients/mojo_renderer.h

Index: media/mojo/clients/mojo_renderer.h
diff --git a/media/mojo/clients/mojo_renderer.h b/media/mojo/clients/mojo_renderer.h
index 44cad75635e57f260b4ebc87640bfe3a36480563..214f471f78240596eb8f552739d263661f6801ce 100644
--- a/media/mojo/clients/mojo_renderer.h
+++ b/media/mojo/clients/mojo_renderer.h
@@ -65,6 +65,8 @@ class MojoRenderer : public Renderer, public mojom::RendererClient {
   void OnError() override;
   void OnVideoNaturalSizeChange(const gfx::Size& size) override;
   void OnVideoOpacityChange(bool opaque) override;
+  void OnWaitingForDecryptionKey() override;
+  void OnStatisticsUpdate(mojom::PipelineStatisticsPtr stats) override;
 
   // Binds |remote_renderer_| to the mojo message pipe. Can be called multiple
   // times. If an error occurs during connection, OnConnectionError will be