cc: Pass ideal contents scale to PictureLayerTiling UpdateTilePriorities.

cc/layers/picture_layer_impl.cc

 // Copyright 2012 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/layers/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/time/time.h"
@@ skipping 407 matching lines @@
 
   DCHECK(raster_page_scale_);
   DCHECK(raster_device_scale_);
   DCHECK(raster_source_scale_);
   DCHECK(raster_contents_scale_);
   DCHECK(low_res_raster_contents_scale_);
 
   was_screen_space_transform_animating_ =
       draw_properties().screen_space_transform_is_animating;
 
-  // TODO(sohanjg): Avoid needlessly update priorities when syncing to a
-  // non-updated tree which will then be updated immediately afterwards.
   should_update_tile_priorities_ = true;
 
   UpdateTilePriorities();
 
   if (layer_tree_impl()->IsPendingTree())
     MarkVisibleResourcesAsRequired();
 }
 
 void PictureLayerImpl::UpdateTilePriorities() {
   TRACE_EVENT0("cc", "PictureLayerImpl::UpdateTilePriorities");
@@ skipping 25 matching lines @@
               screen_to_layer, gfx::Rect(viewport_size_for_tile_priority_)));
       visible_rect_in_content_space.Intersect(gfx::Rect(content_bounds()));
     }
   }
 
   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
       visible_rect_in_content_space, 1.f / contents_scale_x());
   WhichTree tree =
       layer_tree_impl()->IsActiveTree() ? ACTIVE_TREE : PENDING_TREE;
   for (size_t i = 0; i < tilings_->num_tilings(); ++i) {
-    // TODO(sohanjg): Passing MaximumContentsScale as layer contents scale
-    // in UpdateTilePriorities is wrong and should be ideal contents scale.
     tilings_->tiling_at(i)->UpdateTilePriorities(tree,
                                                  visible_layer_rect,
-                                                 MaximumTilingContentsScale(),
+                                                 ideal_contents_scale_,
                                                  current_frame_time_in_seconds);
   }
 
   // Tile priorities were modified.
   layer_tree_impl()->DidModifyTilePriorities();
 }
 
 void PictureLayerImpl::NotifyTileStateChanged(const Tile* tile) {
   if (layer_tree_impl()->IsActiveTree()) {
     gfx::RectF layer_damage_rect =
@@ skipping 1123 matching lines @@
   return iterator_index_ < iterators_.size();
 }
 
 bool PictureLayerImpl::LayerEvictionTileIterator::IsCorrectType(
     PictureLayerTiling::TilingEvictionTileIterator* it) const {
   return it->get_type() == iteration_stage_ &&
          (**it)->required_for_activation() == required_for_activation_;
 }
 
 }  // namespace cc