Move LayerSorter to exist locally only in layer_tree_host_common

cc/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/picture_layer_impl.h"
 
 #include "base/time.h"
 #include "cc/append_quads_data.h"
 #include "cc/checkerboard_draw_quad.h"
 #include "cc/debug_border_draw_quad.h"
 #include "cc/debug_colors.h"
 #include "cc/layer_tree_host_impl.h"
 #include "cc/math_util.h"
 #include "cc/quad_sink.h"
 #include "cc/solid_color_draw_quad.h"
 #include "cc/tile_draw_quad.h"
+#include "ui/gfx/quad_f.h"
 
 namespace cc {
 
 PictureLayerImpl::PictureLayerImpl(int id) :
     LayerImpl(id),
     tilings_(this),
     pile_(PicturePileImpl::Create()),
     last_update_time_(0) {
 }
 
@@ skipping 144 matching lines @@
       GL_RGBA,
       rect,
       tiling->contents_scale()));
 }
 
 void PictureLayerImpl::SyncFromActiveLayer(const PictureLayerImpl* other) {
   tilings_.CloneFrom(other->tilings_);
 }
 
 }  // namespace cc