cc: Convert non-const reference arguments to pointers.

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 540 matching lines @@
   float contents_scale = raster_scale * device_scale_factor;
   if (!layer->bounds_contain_page_scale())
     contents_scale *= page_scale_factor;
 
   CalculateContentsScale(layer, contents_scale, animating_transform_to_screen);
 }
 
 template <typename LayerType, typename LayerList>
 static inline void RemoveSurfaceForEarlyExit(
     LayerType* layer_to_remove,
-    LayerList& render_surface_layer_list) {
+    LayerList* render_surface_layer_list) {
   DCHECK(layer_to_remove->render_surface());
   // Technically, we know that the layer we want to remove should be
   // at the back of the render_surface_layer_list. However, we have had
   // bugs before that added unnecessary layers here
   // (https://bugs.webkit.org/show_bug.cgi?id=74147), but that causes
   // things to crash. So here we proactively remove any additional
   // layers from the end of the list.
   while (render_surface_layer_list->back() != layer_to_remove) {
     render_surface_layer_list->back()->ClearRenderSurface();
     render_surface_layer_list->pop_back();
@@ skipping 1004 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