Clean up PointIsClippedBySurfaceOrClipRect

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 <limits>
 #include <set>
 
 #include "base/debug/trace_event.h"
@@ skipping 1097 matching lines @@
             screen_space_point,
             current_layer->render_surface()->screen_space_transform(),
             current_layer->render_surface()->content_rect(),
             NULL))
       return true;
 
     // Note that drawable content rects are actually in target surface space, so
     // the transform we have to provide is the target surface's
     // screen_space_transform.
     LayerImpl* render_target = current_layer->render_target();
-    if (LayerClipsSubtree(current_layer) &&
+    if (render_target && LayerClipsSubtree(current_layer) &&
         !PointHitsRect(
             screen_space_point,
             render_target->render_surface()->screen_space_transform(),
             current_layer->drawable_content_rect(),
             NULL))
       return true;
 
     current_layer = current_layer->parent();
   }
 
@@ skipping 140 matching lines @@
 LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPointInTouchHandlerRegion(
     const gfx::PointF& screen_space_point) {
   FindTouchEventLayerFunctor func = {screen_space_point};
   FindClosestMatchingLayerDataForRecursion data_for_recursion;
   FindClosestMatchingLayer(
       screen_space_point, root_layer(), func, &data_for_recursion);
   return data_for_recursion.closest_match;
 }
 
 }  // namespace cc