Tiling priorities in Android Webview.

cc/output/output_surface_client.h

Index: cc/output/output_surface_client.h
diff --git a/cc/output/output_surface_client.h b/cc/output/output_surface_client.h
index 2c6c1281b88d2608f2b9375a7a26473204775ae8..bb37a9144c9b4bb78923316341cbedb04435ba45 100644
--- a/cc/output/output_surface_client.h
+++ b/cc/output/output_surface_client.h
@@ -38,10 +38,13 @@ class CC_EXPORT OutputSurfaceClient {
   virtual void DidSwapBuffersComplete() = 0;
   virtual void ReclaimResources(const CompositorFrameAck* ack) = 0;
   virtual void DidLoseOutputSurface() = 0;
-  virtual void SetExternalDrawConstraints(const gfx::Transform& transform,
-                                          const gfx::Rect& viewport,
-                                          const gfx::Rect& clip,
-                                          bool resourceless_software_draw) = 0;
+  virtual void SetExternalDrawConstraints(
+      const gfx::Transform& transform,
+      const gfx::Rect& viewport,
+      const gfx::Rect& clip,
+      const gfx::Rect& viewport_rect_for_tile_priority,
+      const gfx::Transform& transform_for_tile_priority,
+      bool resourceless_software_draw) = 0;
   virtual void SetMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
   // If set, |callback| will be called subsequent to each new tree activation,
   // regardless of the compositor visibility or damage. |callback| must remain