Mozart: Generalize frame scheduling.

mojo/services/gfx/composition/interfaces/renderers.mojom

Index: mojo/services/gfx/composition/interfaces/renderers.mojom
diff --git a/mojo/services/gfx/composition/interfaces/renderers.mojom b/mojo/services/gfx/composition/interfaces/renderers.mojom
index a911d405f6dc34618bd19d38a27a606225631469..97f8d89822528eda5657d5479b41bda3ba6571e8 100644
--- a/mojo/services/gfx/composition/interfaces/renderers.mojom
+++ b/mojo/services/gfx/composition/interfaces/renderers.mojom
@@ -8,6 +8,7 @@ module mojo.gfx.composition;
 import "mojo/services/geometry/interfaces/geometry.mojom";
 import "mojo/services/gfx/composition/interfaces/hit_tests.mojom";
 import "mojo/services/gfx/composition/interfaces/scene_token.mojom";
+import "mojo/services/gfx/composition/interfaces/scheduling.mojom";
 
 // The renderer is a service which renders a scene graph to a display.
 //
@@ -36,6 +37,9 @@ interface Renderer {
   // Dissociates the root scene from the renderer.
   ClearRootScene();
 
+  // Gets a scheduler to receive frame timing information for the renderer.
+  GetScheduler(FrameScheduler& scheduler);
+
   // Provides an interface which can be used to perform hit tests on the
   // contents of the renderer's scene graph.
   GetHitTester(HitTester& hit_tester);