cc: Declare high res tilings to not have low res content.

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 <cmath>
 #include <limits>
 #include <set>
@@ skipping 795 matching lines @@
 void PictureLayerImpl::AddTilingsForRasterScale() {
   // Reset all resolution enums on tilings, we'll be setting new values in this
   // function.
   tilings_->MarkAllTilingsNonIdeal();
 
   PictureLayerTiling* high_res =
       tilings_->FindTilingWithScale(raster_contents_scale_);
   if (!high_res) {
     // We always need a high res tiling, so create one if it doesn't exist.
     high_res = AddTiling(raster_contents_scale_);
-  } else if (high_res->was_ever_low_resolution()) {
+  } else if (high_res->may_contain_low_resolution_tiles()) {
     // If the tiling we find here was LOW_RESOLUTION previously, it may not be
     // fully rastered, so destroy the old tiles.
     high_res->Reset();
+    // Reset the flag now that we'll make it high res, it will have fully
+    // rastered content.
+    high_res->reset_may_contain_low_resolution_tiles();
   }
   high_res->set_resolution(HIGH_RESOLUTION);
 
   // If the low res scale is the same as the high res scale, that tiling
   // will be treated as high res.
   if (layer_tree_impl()->create_low_res_tiling() &&
       raster_contents_scale_ != low_res_raster_contents_scale_) {
     PictureLayerTiling* low_res =
         tilings_->FindTilingWithScale(low_res_raster_contents_scale_);
 
@@ skipping 395 matching lines @@
 
 bool PictureLayerImpl::IsOnActiveOrPendingTree() const {
   return !layer_tree_impl()->IsRecycleTree();
 }
 
 bool PictureLayerImpl::HasValidTilePriorities() const {
   return IsOnActiveOrPendingTree() && IsDrawnRenderSurfaceLayerListMember();
 }
 
 }  // namespace cc