cc: Fix tree activation when invisible layers exist.

cc/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/picture_layer_tiling.h"
 
 #include "cc/math_util.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/size_conversions.h"
 
@@ skipping 122 matching lines @@
   }
 }
 
 PictureLayerTiling::Iterator::Iterator()
     : tiling_(NULL),
       current_tile_(NULL),
       tile_i_(0),
       tile_j_(0),
       left_(0),
       top_(0),
-      right_(0),
-      bottom_(0) {
+      right_(-1),
+      bottom_(-1) {
 }
 
 PictureLayerTiling::Iterator::Iterator(const PictureLayerTiling* tiling,
                                        float dest_scale,
                                        gfx::Rect dest_rect)
     : tiling_(tiling),
       dest_rect_(dest_rect),
       dest_to_content_scale_(tiling_->contents_scale_ / dest_scale),
       current_tile_(NULL),
       tile_i_(0),
       tile_j_(0),
       left_(0),
       top_(0),
-      right_(0),
-      bottom_(0) {
+      right_(-1),
+      bottom_(-1) {
   DCHECK(tiling_);
   if (dest_rect_.IsEmpty())
     return;
 
   gfx::Rect content_rect =
       gfx::ToEnclosingRect(gfx::ScaleRect(dest_rect_, dest_to_content_scale_));
 
   left_ = tiling_->tiling_data_.TileXIndexFromSrcCoord(content_rect.x());
   top_ = tiling_->tiling_data_.TileYIndexFromSrcCoord(content_rect.y());
   right_ = tiling_->tiling_data_.TileXIndexFromSrcCoord(
@@ skipping 148 matching lines @@
 void PictureLayerTiling::MoveTilePriorities(WhichTree src_tree,
                                             WhichTree dst_tree) {
   DCHECK(src_tree != dst_tree);
   for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end(); ++it) {
     it->second->set_priority(dst_tree, it->second->priority(src_tree));
     it->second->set_priority(src_tree, TilePriority());
   }
 }
 
 }  // namespace cc