cc: Low quality support for low res tiles

cc/resources/picture_layer_tiling.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/resources/picture_layer_tiling.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/debug/trace_event.h"
@@ skipping 479 matching lines @@
   state->SetDouble("content_scale", contents_scale_);
   state->Set("content_bounds",
              MathUtil::AsValue(ContentRect().size()).release());
   return state.PassAs<base::Value>();
 }
 
 size_t PictureLayerTiling::GPUMemoryUsageInBytes() const {
   size_t amount = 0;
   for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end(); ++it) {
     const Tile* tile = it->second.get();
-    amount += tile->tile_version().GPUMemoryUsageInBytes();
+    for (int mode = 0; mode < NUM_RASTER_MODES; ++mode) {
+      amount += tile->tile_version(
+          static_cast<TileRasterMode>(mode)).GPUMemoryUsageInBytes();
+    }
   }
   return amount;
 }
 
 namespace {
 
 // This struct represents an event at which the expending rect intersects
 // one of its boundaries.  4 intersection events will occur during expansion.
 struct EdgeEvent {
   enum { BOTTOM, TOP, LEFT, RIGHT } edge;
@@ skipping 110 matching lines @@
 
     // If our delta is less then our event distance, we're done.
     if (delta < event.distance)
       break;
   }
 
   return gfx::Rect(origin_x, origin_y, width, height);
 }
 
 }  // namespace cc