cc: Ensure to process active low res pending high res tilings at raster

cc/tiles/tiling_set_raster_queue_all.cc

 // Copyright 2014 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/tiles/tiling_set_raster_queue_all.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 17 matching lines @@
 
   // Early out if the tiling set has no tilings.
   if (!tiling_set_->num_tilings())
     return;
 
   const PictureLayerTilingClient* client = tiling_set->client();
   WhichTree tree = tiling_set->tree();
   // Find high and low res tilings and initialize the iterators.
   PictureLayerTiling* high_res_tiling = nullptr;
   PictureLayerTiling* low_res_tiling = nullptr;
-  // This variable would point to a tiling that has a NON_IDEAL_RESOLUTION
-  // resolution on the active tree, but HIGH_RESOLUTION on the pending tree.
-  // These tilings are the only non-ideal tilings that could have required for
-  // activation tiles, so they need to be considered for rasterization.
+  // This variable would point to a tiling that has a NON_IDEAL_RESOLUTION or
+  // LOW_RESOLUTION on the active tree, but HIGH_RESOLUTION on the pending tree.
+  // These tilings are the only non-high res tilings that could have required
+  // for activation tiles, so they need to be considered for rasterization.
   PictureLayerTiling* active_non_ideal_pending_high_res_tiling = nullptr;
   for (size_t i = 0; i < tiling_set_->num_tilings(); ++i) {
     PictureLayerTiling* tiling = tiling_set_->tiling_at(i);
     if (tiling->resolution() == HIGH_RESOLUTION)
       high_res_tiling = tiling;
     if (prioritize_low_res && tiling->resolution() == LOW_RESOLUTION)
       low_res_tiling = tiling;
-    if (tree == ACTIVE_TREE && tiling->resolution() == NON_IDEAL_RESOLUTION) {
+    if (tree == ACTIVE_TREE && tiling->resolution() != HIGH_RESOLUTION) {
       const PictureLayerTiling* twin =
           client->GetPendingOrActiveTwinTiling(tiling);
       if (twin && twin->resolution() == HIGH_RESOLUTION)
         active_non_ideal_pending_high_res_tiling = tiling;
     }
   }
 
   bool use_low_res_tiling = low_res_tiling && low_res_tiling->has_tiles() &&
                             !low_res_tiling->all_tiles_done();
   bool use_high_res_tiling = high_res_tiling && high_res_tiling->has_tiles() &&
@@ skipping 383 matching lines @@
         current_tile_ = PrioritizedTile();
         return *this;
       }
       current_tile_ = *eventually_iterator_;
       break;
   }
   return *this;
 }
 
 }  // namespace cc