Integrate Surface requests with MediaPlayerRenderer

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 42c506d4d8978a2e74aff49417cd21615d102d39..eff610e4facac6bed14ea2d228ac29e1d632ff16 100644
--- a/media/mojo/clients/mojo_renderer.h
+++ b/media/mojo/clients/mojo_renderer.h
@@ -56,6 +56,13 @@ class MojoRenderer : public Renderer, public mojom::RendererClient {
   bool HasAudio() override;
   bool HasVideo() override;
 
+  using ReceiveSurfaceRequestTokenCB = base::Callback<void(bool, uint64_t)>;
+
+  // Asks |remote_renderer_| to register a request in the browser's
+  // ScopedSurfaceRequestManager, and returns the request's token.
+  void InitiateScopedSurfaceRequest(
+      ReceiveSurfaceRequestTokenCB receive_request_token_cb);
+
  private:
   // mojom::RendererClient implementation, dispatched on the
   // |task_runner_|.