WIP Hittest Component.

cc/surfaces/display.h

Index: cc/surfaces/display.h
diff --git a/cc/surfaces/display.h b/cc/surfaces/display.h
index 5e0142a42fbd6b7d2937b377f9ed5f542dc868db..99a7cbd9082f7f66aaee4bf5a16173f791a651b6 100644
--- a/cc/surfaces/display.h
+++ b/cc/surfaces/display.h
@@ -94,6 +94,7 @@ class CC_SURFACES_EXPORT Display : public DisplaySchedulerClient,
   void OnSurfaceDestroyed(const SurfaceId& surface_id) override;
   void OnSurfaceDamageExpected(const SurfaceId& surface_id,
                                const BeginFrameArgs& args) override;
+  void OnSurfaceWillDraw(const SurfaceId& surface_id) override {}
 
   bool has_scheduler() const { return !!scheduler_; }
   DirectRenderer* renderer_for_testing() const { return renderer_.get(); }