cc: Clean up iterator template to only take 1 parameter.

cc/trees/layer_tree_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/trees/layer_tree_impl.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/math_util.h"
@@ skipping 461 matching lines @@
   {
     TRACE_EVENT2("cc",
                  "LayerTreeImpl::UpdateTilePriorities",
                  "IsActive",
                  IsActiveTree(),
                  "SourceFrameNumber",
                  source_frame_number_);
     // LayerIterator is used here instead of CallFunctionForSubtree to only
     // UpdateTilePriorities on layers that will be visible (and thus have valid
     // draw properties) and not because any ordering is required.
-    typedef LayerIterator<LayerImpl,
-                          LayerImplList,
-                          RenderSurfaceImpl,
-                          LayerIteratorActions::FrontToBack> LayerIteratorType;
+    typedef LayerIterator<LayerImpl> LayerIteratorType;
     LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list_);
     for (LayerIteratorType it =
              LayerIteratorType::Begin(&render_surface_layer_list_);
          it != end;
          ++it) {
       if (!it.represents_itself())
         continue;
       LayerImpl* layer = *it;
 
       layer->UpdateTilePriorities();
@@ skipping 233 matching lines @@
 }
 
 scoped_ptr<base::Value> LayerTreeImpl::AsValue() const {
   scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue());
   TracedValue::MakeDictIntoImplicitSnapshot(
       state.get(), "cc::LayerTreeImpl", this);
 
   state->Set("root_layer", root_layer_->AsValue().release());
 
   scoped_ptr<base::ListValue> render_surface_layer_list(new base::ListValue());
-  typedef LayerIterator<LayerImpl,
-                        LayerImplList,
-                        RenderSurfaceImpl,
-                        LayerIteratorActions::FrontToBack> LayerIteratorType;
+  typedef LayerIterator<LayerImpl> LayerIteratorType;
   LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list_);
   for (LayerIteratorType it = LayerIteratorType::Begin(
            &render_surface_layer_list_); it != end; ++it) {
     if (!it.represents_itself())
       continue;
     render_surface_layer_list->Append(TracedValue::CreateIDRef(*it).release());
   }
 
   state->Set("render_surface_layer_list",
              render_surface_layer_list.release());
@@ skipping 210 matching lines @@
 const std::vector<LayerImpl*>& LayerTreeImpl::LayersWithCopyOutputRequest()
     const {
   // Only the active tree needs to know about layers with copy requests, as
   // they are aborted if not serviced during draw.
   DCHECK(IsActiveTree());
 
   return layers_with_copy_output_request_;
 }
 
 }  // namespace cc