Integrate Surface requests with MediaPlayerRenderer

media/mojo/interfaces/renderer.mojom

Index: media/mojo/interfaces/renderer.mojom
diff --git a/media/mojo/interfaces/renderer.mojom b/media/mojo/interfaces/renderer.mojom
index 8d392878b9df41d6aac629fdc5a088430174999e..9144776c637bd3c9c7c2e54b5ec0be43f7cbcf24 100644
--- a/media/mojo/interfaces/renderer.mojom
+++ b/media/mojo/interfaces/renderer.mojom
@@ -35,6 +35,12 @@ interface Renderer {
   // Attaches the CDM associated with |cdm_id| to the renderer service,
   // executing the callback with whether the CDM was successfully attached.
   SetCdm(int32 cdm_id) => (bool success);
+
+  // Registers a new request in the ScopedSurfaceRequestManager, and returns
+  // its token.
+  // Returns base::nullopt in failure or unsupported cases.
+  InitiateScopedSurfaceRequest()
+      => (mojo.common.mojom.UnguessableToken? request_token);
 };
 
 interface RendererClient {