Move have_wheel_event_handlers to WebLayerTreeView.

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 <stddef.h>
 
 #include <algorithm>
 
@@ skipping 1110 matching lines @@
 
   if (layer->clip_children()) {
     size_t num_clip_children = layer->clip_children()->size();
     DCHECK_GE(recursive_data->num_unclipped_descendants, num_clip_children);
     recursive_data->num_unclipped_descendants -= num_clip_children;
   }
 
   if (layer->HasCopyRequest())
     recursive_data->num_layer_or_descendants_with_copy_request++;
 
-  if (!layer->touch_event_handler_region().IsEmpty() ||
-      layer->have_wheel_event_handlers())
+  if (!layer->touch_event_handler_region().IsEmpty())
     recursive_data->num_layer_or_descendants_with_input_handler++;

[Rick Byers, 2016/01/28 00:18:31]

nit: rename this from "input_handlers" to "touch_handlers" to be correct now.

[dtapuska, 2016/01/28 16:23:06]

Done.

 
   layer->set_num_unclipped_descendants(
       recursive_data->num_unclipped_descendants);
 
   if (IsRootLayer(layer))
     layer->layer_tree_host()->SetNeedsMetaInfoRecomputation(false);
 }
 
 static void PreCalculateMetaInformationInternal(
     LayerImpl* layer,
@@ skipping 25 matching lines @@
 
   if (layer->clip_children()) {
     size_t num_clip_children = layer->clip_children()->size();
     DCHECK_GE(recursive_data->num_unclipped_descendants, num_clip_children);
     recursive_data->num_unclipped_descendants -= num_clip_children;
   }
 
   if (layer->HasCopyRequest())
     recursive_data->num_layer_or_descendants_with_copy_request++;
 
-  if (!layer->touch_event_handler_region().IsEmpty() ||
-      layer->have_wheel_event_handlers())
+  if (!layer->touch_event_handler_region().IsEmpty())
     recursive_data->num_layer_or_descendants_with_input_handler++;
 
   layer->draw_properties().num_unclipped_descendants =
       recursive_data->num_unclipped_descendants;
   layer->set_layer_or_descendant_has_input_handler(
       (recursive_data->num_layer_or_descendants_with_input_handler != 0));
   // TODO(enne): this should be synced from the main thread, so is only
   // for tests constructing layers on the compositor thread.
   layer->SetNumDescendantsThatDrawContent(
       recursive_data->num_descendants_that_draw_content);
@@ skipping 1642 matching lines @@
 
 PropertyTrees* GetPropertyTrees(Layer* layer) {
   return layer->layer_tree_host()->property_trees();
 }
 
 PropertyTrees* GetPropertyTrees(LayerImpl* layer) {
   return layer->layer_tree_impl()->property_trees();
 }
 
 }  // namespace cc