Do not skip subtrees with wheel or touch handlers

cc/layers/draw_properties.h

 // Copyright 2012 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.
 
 #ifndef CC_LAYERS_DRAW_PROPERTIES_H_
 #define CC_LAYERS_DRAW_PROPERTIES_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/transform.h"
@@ skipping 11 matching lines @@
         target_space_transform_is_animating(false),
         screen_space_transform_is_animating(false),
         can_use_lcd_text(false),
         is_clipped(false),
         render_target(NULL),
         contents_scale_x(1.f),
         contents_scale_y(1.f),
         num_descendants_that_draw_content(0),
         num_unclipped_descendants(0),
         layer_or_descendant_has_copy_request(false),
+        layer_or_descendant_has_handler(false),

[danakj, 2014/06/12 18:24:41]

nit: has_input_handler?

         has_child_with_a_scroll_parent(false),
         sorted_for_recursion(false),
         index_of_first_descendants_addition(0),
         num_descendants_added(0),
         index_of_first_render_surface_layer_list_addition(0),
         num_render_surfaces_added(0),
         last_drawn_render_surface_layer_list_id(0) {}
 
   // Transforms objects from content space to target surface space, where
   // this layer would be drawn.
@@ skipping 53 matching lines @@
   int num_descendants_that_draw_content;
 
   // Number of descendants with a clip parent that is our ancestor. NB - this
   // does not include our clip children because they are clipped by us.
   int num_unclipped_descendants;
 
   // If true, the layer or some layer in its sub-tree has a CopyOutputRequest
   // present on it.
   bool layer_or_descendant_has_copy_request;
 
+  // If true, the layer or one of its descendants has a wheel or touch handler.
+  bool layer_or_descendant_has_handler;
+
   // This is true if the layer has any direct child that has a scroll parent.
   // This layer will not be the scroll parent in this case. This information
   // lets us avoid work in CalculateDrawPropertiesInternal -- if none of our
   // children have scroll parents, we will not need to recur out of order.
   bool has_child_with_a_scroll_parent;
 
   // This is true if the order (wrt to its siblings in the tree) in which the
   // layer will be visited while computing draw properties has been determined.
   bool sorted_for_recursion;
 
@@ skipping 11 matching lines @@
   // these draw properties and determined that this layer will draw itself.
   // If these draw properties are not a part of the render surface layer list,
   // or the layer doesn't contribute anything, then this ID will be either out
   // of date or 0.
   int last_drawn_render_surface_layer_list_id;
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_DRAW_PROPERTIES_H_