Fix UpdateTilePriorities viewport in Android WebView.

cc/test/fake_output_surface_client.h

Index: cc/test/fake_output_surface_client.h
diff --git a/cc/test/fake_output_surface_client.h b/cc/test/fake_output_surface_client.h
index 5a824e76deeb692f2763ff26348b7c90d64af59c..24c8c74c36b98d97545491fac69b0677c7bbf53d 100644
--- a/cc/test/fake_output_surface_client.h
+++ b/cc/test/fake_output_surface_client.h
@@ -27,8 +27,11 @@ class FakeOutputSurfaceClient : public OutputSurfaceClient {
   virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE;
   virtual void OnSwapBuffersComplete(const CompositorFrameAck* ack) OVERRIDE {}
   virtual void DidLoseOutputSurface() OVERRIDE;
-  virtual void SetExternalDrawConstraints(const gfx::Transform& transform,
-                                          gfx::Rect viewport) OVERRIDE {}
+  virtual void SetExternalDrawConstraints(
+      const gfx::Transform& transform,
+      gfx::Rect viewport,
+      gfx::Rect clip,
+      bool valid_for_tile_management) OVERRIDE {}
   virtual void SetExternalStencilTest(bool enable) OVERRIDE {}
   virtual void SetMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE;
   virtual void SetDiscardBackBufferWhenNotVisible(bool discard) OVERRIDE;