Communicate whether passive event listeners exist to cc.

cc/trees/layer_tree_impl.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_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/values.h"
 #include "cc/base/synced_property.h"
+#include "cc/input/event_listener_properties.h"
 #include "cc/input/layer_selection_bound.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/output/renderer.h"
 #include "cc/output/swap_promise.h"
 #include "cc/resources/ui_resource_client.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/property_tree.h"
 
 namespace base {
@@ skipping 409 matching lines @@
                                       const gfx::BoxF& box,
                                       gfx::BoxF* bounds) const;
 
   bool have_scroll_event_handlers() const {
     return have_scroll_event_handlers_;
   }
   void set_have_scroll_event_handlers(bool have_event_handlers) {
     have_scroll_event_handlers_ = have_event_handlers;
   }
 
-  bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
-  void set_have_wheel_event_handlers(bool have_event_handlers) {
-    have_wheel_event_handlers_ = have_event_handlers;
+  EventListenerProperties event_listener_properties(
+      EventListenerClass event_class) const {
+    return event_listener_properties_[static_cast<size_t>(event_class)];
+  }
+  void set_event_listener_properties(EventListenerClass event_class,
+                                     EventListenerProperties event_properties) {
+    event_listener_properties_[static_cast<size_t>(event_class)] =
+        event_properties;
   }
 
  protected:
   explicit LayerTreeImpl(
       LayerTreeHostImpl* layer_tree_host_impl,
       scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor,
       scoped_refptr<SyncedTopControls> top_controls_shown_ratio,
       scoped_refptr<SyncedElasticOverscroll> elastic_overscroll);
   float ClampPageScaleFactorToLimits(float page_scale_factor) const;
   void PushPageScaleFactorAndLimits(const float* page_scale_factor,
@@ skipping 70 matching lines @@
   bool has_ever_been_drawn_;
 
   std::vector<scoped_ptr<SwapPromise>> swap_promise_list_;
   std::vector<scoped_ptr<SwapPromise>> pinned_swap_promise_list_;
 
   UIResourceRequestQueue ui_resource_request_queue_;
 
   int render_surface_layer_list_id_;
 
   bool have_scroll_event_handlers_;
-  bool have_wheel_event_handlers_;
+  EventListenerProperties event_listener_properties_[static_cast<size_t>(
+      EventListenerClass::kNumClasses)];
 
   // Whether or not Blink's viewport size was shrunk by the height of the top
   // controls at the time of the last layout.
   bool top_controls_shrink_blink_size_;
   float top_controls_height_;
 
   // The amount that the top controls are shown from 0 (hidden) to 1 (fully
   // shown).
   scoped_refptr<SyncedTopControls> top_controls_shown_ratio_;
 
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_