Move LayerSorter to exist locally only in layer_tree_host_common

cc/layer_impl.cc

 // Copyright 2011 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/layer_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/stringprintf.h"
 #include "cc/debug_border_draw_quad.h"
 #include "cc/debug_colors.h"
-#include "cc/layer_sorter.h"
 #include "cc/layer_tree_host_impl.h"
 #include "cc/math_util.h"
 #include "cc/proxy.h"
 #include "cc/quad_sink.h"
 #include "cc/scrollbar_animation_controller.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/rect_conversions.h"
 
 namespace cc {
 
@@ skipping 287 matching lines @@
     base::StringAppendF(str, "drawTransform: %f, %f, %f, %f  //  %f, %f, %f, %f  //  %f, %f, %f, %f  //  %f, %f, %f, %f\n",
         transform.matrix().getDouble(0, 0), transform.matrix().getDouble(0, 1), transform.matrix().getDouble(0, 2), transform.matrix().getDouble(0, 3),
         transform.matrix().getDouble(1, 0), transform.matrix().getDouble(1, 1), transform.matrix().getDouble(1, 2), transform.matrix().getDouble(1, 3),
         transform.matrix().getDouble(2, 0), transform.matrix().getDouble(2, 1), transform.matrix().getDouble(2, 2), transform.matrix().getDouble(2, 3),
         transform.matrix().getDouble(3, 0), transform.matrix().getDouble(3, 1), transform.matrix().getDouble(3, 2), transform.matrix().getDouble(3, 3));
 
     str->append(indentStr);
     base::StringAppendF(str, "drawsContent: %s\n", m_drawsContent ? "yes" : "no");
 }
 
-void sortLayers(std::vector<LayerImpl*>::iterator first, std::vector<LayerImpl*>::iterator end, LayerSorter* layerSorter)
-{
-    TRACE_EVENT0("cc", "LayerImpl::sortLayers");
-    layerSorter->sort(first, end);
-}
-
 std::string LayerImpl::layerTreeAsText() const
 {
     std::string str;
     dumpLayer(&str, 0);
     return str;
 }
 
 void LayerImpl::dumpLayer(std::string* str, int indent) const
 {
     str->append(indentString(indent));
@@ skipping 388 matching lines @@
 
 void LayerImpl::setVerticalScrollbarLayer(ScrollbarLayerImpl* scrollbarLayer)
 {
     if (!m_scrollbarAnimationController)
         m_scrollbarAnimationController = ScrollbarAnimationController::create(this);
     m_scrollbarAnimationController->setVerticalScrollbarLayer(scrollbarLayer);
     m_scrollbarAnimationController->updateScrollOffset(this);
 }
 
 }  // namespace cc