Fix UpdateTilePriorities viewport in Android WebView.

cc/output/output_surface.h

Index: cc/output/output_surface.h
diff --git a/cc/output/output_surface.h b/cc/output/output_surface.h
index a94d41efd7370896c3130ecd42ee160e3e86a545..84d128aa023b7dd7c3c25fe5b2ce36e3dd8951be 100644
--- a/cc/output/output_surface.h
+++ b/cc/output/output_surface.h
@@ -168,7 +168,9 @@ class CC_EXPORT OutputSurface : public FrameRateControllerClient {
   void DidLoseOutputSurface();
   void SetExternalStencilTest(bool enabled);
   void SetExternalDrawConstraints(const gfx::Transform& transform,
-                                  gfx::Rect viewport);
+                                  gfx::Rect viewport,
+                                  gfx::Rect clip,
+                                  bool valid_for_tile_management);
 
   // virtual for testing.
   virtual base::TimeDelta AlternateRetroactiveBeginFramePeriod();