Revert "Revert 253606 "Revert 251238 "cc: Clean up iterator template to ...""

cc/trees/layer_tree_host_common.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_host_common.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
 #include "cc/base/math_util.h"
@@ skipping 2306 matching lines @@
   // If we have finished walking all ancestors without having already exited,
   // then the point is not clipped by any ancestors.
   return false;
 }
 
 LayerImpl* LayerTreeHostCommon::FindLayerThatIsHitByPoint(
     const gfx::PointF& screen_space_point,
     const LayerImplList& render_surface_layer_list) {
   LayerImpl* found_layer = NULL;
 
-  typedef LayerIterator<LayerImpl> LayerIteratorType;
+  typedef LayerIterator<LayerImpl,
+                        LayerImplList,
+                        RenderSurfaceImpl,
+                        LayerIteratorActions::FrontToBack> LayerIteratorType;
   LayerIteratorType end = LayerIteratorType::End(&render_surface_layer_list);
+
   for (LayerIteratorType
            it = LayerIteratorType::Begin(&render_surface_layer_list);
        it != end;
        ++it) {
     // We don't want to consider render_surfaces for hit testing.
     if (!it.represents_itself())
       continue;
 
     LayerImpl* current_layer = (*it);
 
@@ skipping 58 matching lines @@
   // At this point, we think the point does hit the touch event handler region
   // on the layer, but we need to walk up the parents to ensure that the layer
   // was not clipped in such a way that the hit point actually should not hit
   // the layer.
   if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl))
     return false;
 
   return true;
 }
 }  // namespace cc