Track occlusion per tree on Tile.

cc/resources/tile.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/tile.h"
 
 #include <algorithm>
 
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
@@ skipping 12 matching lines @@
            float contents_scale,
            int layer_id,
            int source_frame_number,
            int flags)
     : RefCountedManaged<Tile>(tile_manager),
       tile_manager_(tile_manager),
       tile_size_(tile_size),
       content_rect_(content_rect),
       contents_scale_(contents_scale),
       opaque_rect_(opaque_rect),
-      is_occluded_(false),
       layer_id_(layer_id),
       source_frame_number_(source_frame_number),
       flags_(flags),
       id_(s_next_id_++) {
   set_picture_pile(picture_pile);
+  for (int i = 0; i < NUM_TREES; i++)

[danakj, 2014/07/07 20:26:56]

signed vs unsigned... maybe this works, but you might need size_t to make it
build on windows, i'm not sure. bots will tell us.

+    is_occluded_[i] = false;
 }
 
 Tile::~Tile() {
   TRACE_EVENT_OBJECT_DELETED_WITH_ID(
       TRACE_DISABLED_BY_DEFAULT("cc.debug"),
       "cc::Tile", this);
 }
 
 void Tile::SetPriority(WhichTree tree, const TilePriority& priority) {
   if (priority == priority_[tree])
@@ skipping 45 matching lines @@
 RasterMode Tile::DetermineRasterModeForResolution(
     TileResolution resolution) const {
   RasterMode current_mode = managed_state_.raster_mode;
   RasterMode raster_mode = resolution == LOW_RESOLUTION
                                ? LOW_QUALITY_RASTER_MODE
                                : HIGH_QUALITY_RASTER_MODE;
   return std::min(raster_mode, current_mode);
 }
 
 }  // namespace cc