Communicate whether passive event listeners exist to cc.

cc/trees/layer_tree_host.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <limits>
 #include <set>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "cc/animation/animation.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/frame_timing_tracker.h"
 #include "cc/debug/micro_benchmark.h"
 #include "cc/debug/micro_benchmark_controller.h"
+#include "cc/input/event_listener_properties.h"
 #include "cc/input/input_handler.h"
 #include "cc/input/layer_selection_bound.h"
 #include "cc/input/scrollbar.h"
 #include "cc/input/top_controls_state.h"
 #include "cc/layers/layer_lists.h"
 #include "cc/output/output_surface.h"
 #include "cc/output/renderer_capabilities.h"
 #include "cc/output/swap_promise.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/scoped_ui_resource.h"
@@ skipping 184 matching lines @@
     return outer_viewport_scroll_layer_.get();
   }
 
   void RegisterSelection(const LayerSelection& selection);
 
   bool have_scroll_event_handlers() const {
     return have_scroll_event_handlers_;
   }
   void SetHaveScrollEventHandlers(bool have_event_handlers);
 
-  bool have_wheel_event_handlers() const { return have_wheel_event_handlers_; }
-  void SetHaveWheelEventHandlers(bool have_event_handlers);
+  void SetEventListenerProperties(EventListenerClass event_class,
+                                  EventListenerProperties event_properties);
+  EventListenerProperties event_listener_properties(
+      EventListenerClass event_class) const {
+    return event_listener_properties_[static_cast<size_t>(event_class)];
+  }
 
   const LayerTreeSettings& settings() const { return settings_; }
 
   void SetDebugState(const LayerTreeDebugState& debug_state);
   const LayerTreeDebugState& debug_state() const { return debug_state_; }
 
   bool has_gpu_rasterization_trigger() const {
     return has_gpu_rasterization_trigger_;
   }
   void SetHasGpuRasterizationTrigger(bool has_trigger);
@@ skipping 287 matching lines @@
   float max_page_scale_factor_;
   gfx::Vector2dF elastic_overscroll_;
   bool has_gpu_rasterization_trigger_;
   bool content_is_suitable_for_gpu_rasterization_;
   bool gpu_rasterization_histogram_recorded_;
 
   SkColor background_color_;
   bool has_transparent_background_;
 
   bool have_scroll_event_handlers_;
-  bool have_wheel_event_handlers_;
+  EventListenerProperties event_listener_properties_[static_cast<size_t>(
+      EventListenerClass::kNumClasses)];
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;
   scoped_ptr<AnimationHost> animation_host_;
 
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
   // If set, then page scale animation has completed, but the client hasn't been
   // notified about it yet.
   bool did_complete_scale_animation_;
 
@@ skipping 23 matching lines @@
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_