Move have_wheel_event_handlers to WebLayerTreeView.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index d44aa67fefea548b7336ed830cc9d27c9471fd60..5cbadf7c5e65507cbc44b0a1dc1bc278ee791783 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -85,6 +85,7 @@ LayerTreeImpl::LayerTreeImpl(
       next_activation_forces_redraw_(false),
       has_ever_been_drawn_(false),
       render_surface_layer_list_id_(0),
+      have_wheel_event_handlers_(false),
       top_controls_shrink_blink_size_(false),
       top_controls_height_(0),
       top_controls_shown_ratio_(top_controls_shown_ratio) {}
@@ -354,6 +355,7 @@ void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
   target_tree->set_source_frame_number(source_frame_number());
   target_tree->set_background_color(background_color());
   target_tree->set_has_transparent_background(has_transparent_background());
+  target_tree->set_have_wheel_event_handlers(have_wheel_event_handlers());
 
   if (ViewportSizeInvalid())
     target_tree->SetViewportSizeInvalid();
@@ -1699,7 +1701,7 @@ struct HitTestVisibleScrollableOrTouchableFunctor {
     return layer->IsDrawnRenderSurfaceLayerListMember() ||
            ScrollsAnyDrawnRenderSurfaceLayerListMember(layer) ||
            !layer->touch_event_handler_region().IsEmpty() ||
-           layer->have_wheel_event_handlers();
+           layer->layer_tree_impl()->have_wheel_event_handlers();
   }
 };
 
@@ -1745,29 +1747,6 @@ static bool LayerHasTouchEventHandlersAt(const gfx::PointF& screen_space_point,
   return true;
 }
 
-struct FindWheelEventLayerFunctor {
-  bool operator()(LayerImpl* layer) const {
-    return layer->have_wheel_event_handlers();
-  }
-};
-
-LayerImpl* LayerTreeImpl::FindLayerWithWheelHandlerThatIsHitByPoint(
-    const gfx::PointF& screen_space_point) {
-  if (!root_layer())
-    return NULL;
-  bool update_lcd_text = false;
-  if (!UpdateDrawProperties(update_lcd_text))
-    return NULL;
-  bool use_property_trees =
-      settings().use_property_trees || settings().verify_property_trees;
-  FindWheelEventLayerFunctor func;
-  FindClosestMatchingLayerDataForRecursion data_for_recursion;
-  FindClosestMatchingLayer(
-      screen_space_point, root_layer(), func, property_trees_.transform_tree,
-      property_trees_.clip_tree, use_property_trees, &data_for_recursion);
-  return data_for_recursion.closest_match;
-}
-
 struct FindTouchEventLayerFunctor {
   bool operator()(LayerImpl* layer) const {
     return LayerHasTouchEventHandlersAt(screen_space_point, layer,