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 e4a351e74602d9965aabe20039b73241d76bb824..3063dfc72966b4fae86efae872b688f004e08ce8 100644
--- a/media/mojo/clients/mojo_renderer.h
+++ b/media/mojo/clients/mojo_renderer.h
@@ -9,6 +9,7 @@
 
 #include "base/macros.h"
 #include "base/time/default_tick_clock.h"
+#include "base/unguessable_token.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/renderer.h"
 #include "media/base/time_delta_interpolator.h"
@@ -58,6 +59,14 @@ class MojoRenderer : public Renderer, public mojom::RendererClient {
   bool HasAudio() override;
   bool HasVideo() override;
 
+  using ReceiveSurfaceRequestTokenCB =
+      base::Callback<void(const base::Optional<base::UnguessableToken>&)>;
+
+  // 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_|.