cc: Fix hit-testing in zero-opacity layers.

cc/test/fake_picture_layer_impl.h

Index: cc/test/fake_picture_layer_impl.h
diff --git a/cc/test/fake_picture_layer_impl.h b/cc/test/fake_picture_layer_impl.h
index 759ceeb93842089a41d0e2d1ffa83ee5767e9355..9e49147d6974db677a7faf7fb98d715882112f9b 100644
--- a/cc/test/fake_picture_layer_impl.h
+++ b/cc/test/fake_picture_layer_impl.h
@@ -26,6 +26,7 @@ class FakePictureLayerImpl : public PictureLayerImpl {
       OVERRIDE;
   virtual void AppendQuads(QuadSink* quad_sink,
                            AppendQuadsData* append_quads_data) OVERRIDE;
+  virtual void UpdateTilePriorities() OVERRIDE;
   virtual gfx::Size CalculateTileSize(gfx::Size content_bounds) const OVERRIDE;
 
   using PictureLayerImpl::AddTiling;
@@ -49,6 +50,9 @@ class FakePictureLayerImpl : public PictureLayerImpl {
   PictureLayerTilingSet* tilings() { return tilings_.get(); }
   PicturePileImpl* pile() { return pile_.get(); }
   size_t append_quads_count() { return append_quads_count_; }
+  size_t update_tile_priorities_count() const {
+    return update_tile_priorities_count_;
+  }
 
   const Region& invalidation() const { return invalidation_; }
   void set_invalidation(const Region& region) { invalidation_ = region; }
@@ -66,6 +70,7 @@ class FakePictureLayerImpl : public PictureLayerImpl {
   gfx::Size fixed_tile_size_;
 
   size_t append_quads_count_;
+  size_t update_tile_priorities_count_;
 };
 
 }  // namespace cc