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

cc/test/fake_picture_layer_impl.cc

Index: cc/test/fake_picture_layer_impl.cc
diff --git a/cc/test/fake_picture_layer_impl.cc b/cc/test/fake_picture_layer_impl.cc
index bdf40a5a2bb45b8534aa210bb09f56b154138302..a65db0dbe492dfc2fccad6f857c44569c1810942 100644
--- a/cc/test/fake_picture_layer_impl.cc
+++ b/cc/test/fake_picture_layer_impl.cc
@@ -11,13 +11,17 @@ FakePictureLayerImpl::FakePictureLayerImpl(
     int id,
     scoped_refptr<PicturePileImpl> pile)
     : PictureLayerImpl(tree_impl, id),
-      append_quads_count_(0) {
+      append_quads_count_(0),
+      update_tile_priorities_count_(0) {
   pile_ = pile;
   SetBounds(pile_->size());
 }
 
 FakePictureLayerImpl::FakePictureLayerImpl(LayerTreeImpl* tree_impl, int id)
-    : PictureLayerImpl(tree_impl, id), append_quads_count_(0) {}
+    : PictureLayerImpl(tree_impl, id),
+      append_quads_count_(0),
+      update_tile_priorities_count_(0) {
+}
 
 scoped_ptr<LayerImpl> FakePictureLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
@@ -31,6 +35,11 @@ void FakePictureLayerImpl::AppendQuads(QuadSink* quad_sink,
   ++append_quads_count_;
 }
 
+void FakePictureLayerImpl::UpdateTilePriorities() {
+  PictureLayerImpl::UpdateTilePriorities();
+  ++update_tile_priorities_count_;
+}
+
 gfx::Size FakePictureLayerImpl::CalculateTileSize(
     gfx::Size content_bounds) const {
   if (fixed_tile_size_.IsEmpty()) {