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

cc/test/fake_picture_layer_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/fake_picture_layer_impl.h"
 
 namespace cc {
 
 FakePictureLayerImpl::FakePictureLayerImpl(
     LayerTreeImpl* tree_impl,
     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) {
   return make_scoped_ptr(
       new FakePictureLayerImpl(tree_impl, id())).PassAs<LayerImpl>();
 }
 
 void FakePictureLayerImpl::AppendQuads(QuadSink* quad_sink,
                                        AppendQuadsData* append_quads_data) {
   PictureLayerImpl::AppendQuads(quad_sink, append_quads_data);
   ++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()) {
     return PictureLayerImpl::CalculateTileSize(content_bounds);
   }
 
   return fixed_tile_size_;
 }
 
 PictureLayerTiling* FakePictureLayerImpl::HighResTiling() const {
@@ skipping 16 matching lines @@
     if (tiling->resolution() == LOW_RESOLUTION) {
       // There should be only one low res tiling.
       CHECK(!result);
       result = tiling;
     }
   }
   return result;
 }
 
 }  // namespace cc