Cache viewport rect for tile priority in UpdateTiles

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"
 
 #include <vector>
 #include "cc/resources/tile.h"
 #include "cc/trees/layer_tree_impl.h"
 
@@ skipping 183 matching lines @@
     TileRequirementCheck is_tile_required_callback) const {
   if (!HasValidTilePriorities())
     return 0;
 
   if (!tilings_)
     return 0;
 
   if (visible_rect_for_tile_priority_.IsEmpty())
     return 0;
 
-  gfx::Rect rect = GetViewportForTilePriorityInContentSpace();
+  gfx::Rect rect = viewport_rect_for_tile_priority_in_content_space_;
   rect.Intersect(visible_rect_for_tile_priority_);
 
   size_t count = 0;
 
   for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
     PictureLayerTiling* tiling = tilings_->tiling_at(i);
     if (tiling->resolution() != HIGH_RESOLUTION &&
         tiling->resolution() != LOW_RESOLUTION)
       continue;
 
@@ skipping 33 matching lines @@
   return CountTilesRequired(
       &PictureLayerTiling::IsTileRequiredForDrawIfVisible);
 }
 
 void FakePictureLayerImpl::ReleaseResources() {
   PictureLayerImpl::ReleaseResources();
   ++release_resources_count_;
 }
 
 }  // namespace cc