Communicate whether passive event listeners exist to cc.

cc/trees/layer_tree_settings.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_settings.h"
 
 #include <GLES2/gl2.h>
 #include <stddef.h>
 #include <limits>
 
@@ skipping 85 matching lines @@
           static_cast<size_t>(gfx::BufferFormat::LAST) + 1,
           GL_TEXTURE_2D),
       ignore_root_layer_flings(false),
       scheduled_raster_task_limit(32),
       use_occlusion_for_tile_prioritization(false),
       verify_property_trees(false),
       use_property_trees(true),
       image_decode_tasks_enabled(false),
       use_compositor_animation_timelines(true),
       wait_for_beginframe_interval(true),
+      use_mouse_wheel_gestures(false),
       max_staging_buffer_usage_in_bytes(32 * 1024 * 1024),
       memory_policy_(64 * 1024 * 1024,
                      gpu::MemoryAllocation::CUTOFF_ALLOW_EVERYTHING,
                      ManagedMemoryPolicy::kDefaultNumResourcesLimit) {}
 
 LayerTreeSettings::~LayerTreeSettings() {}
 
 bool LayerTreeSettings::operator==(const LayerTreeSettings& other) const {
   return renderer_settings == other.renderer_settings &&
          single_thread_proxy_scheduler == other.single_thread_proxy_scheduler &&
@@ skipping 48 matching lines @@
          ignore_root_layer_flings == other.ignore_root_layer_flings &&
          scheduled_raster_task_limit == other.scheduled_raster_task_limit &&
          use_occlusion_for_tile_prioritization ==
              other.use_occlusion_for_tile_prioritization &&
          verify_property_trees == other.verify_property_trees &&
          use_property_trees == other.use_property_trees &&
          image_decode_tasks_enabled == other.image_decode_tasks_enabled &&
          use_compositor_animation_timelines ==
              other.use_compositor_animation_timelines &&
          wait_for_beginframe_interval == other.wait_for_beginframe_interval &&
+         use_mouse_wheel_gestures == other.use_mouse_wheel_gestures &&
          max_staging_buffer_usage_in_bytes ==
              other.max_staging_buffer_usage_in_bytes &&
          memory_policy_ == other.memory_policy_ &&
          LayerTreeDebugState::Equal(initial_debug_state,
                                     other.initial_debug_state);
 }
 
 void LayerTreeSettings::ToProtobuf(proto::LayerTreeSettings* proto) const {
   renderer_settings.ToProtobuf(proto->mutable_renderer_settings());
   proto->set_single_thread_proxy_scheduler(single_thread_proxy_scheduler);
@@ skipping 44 matching lines @@
   proto->set_ignore_root_layer_flings(ignore_root_layer_flings);
   proto->set_scheduled_raster_task_limit(scheduled_raster_task_limit);
   proto->set_use_occlusion_for_tile_prioritization(
       use_occlusion_for_tile_prioritization);
   proto->set_verify_property_trees(verify_property_trees);
   proto->set_use_property_trees(use_property_trees);
   proto->set_image_decode_tasks_enabled(image_decode_tasks_enabled);
   proto->set_use_compositor_animation_timelines(
       use_compositor_animation_timelines);
   proto->set_wait_for_beginframe_interval(wait_for_beginframe_interval);
+  proto->set_use_mouse_wheel_gestures(use_mouse_wheel_gestures);
   proto->set_max_staging_buffer_usage_in_bytes(
       max_staging_buffer_usage_in_bytes);
   memory_policy_.ToProtobuf(proto->mutable_memory_policy());
   initial_debug_state.ToProtobuf(proto->mutable_initial_debug_state());
 
   for (unsigned u : use_image_texture_targets)
     proto->add_use_image_texture_targets(u);
 }
 
 void LayerTreeSettings::FromProtobuf(const proto::LayerTreeSettings& proto) {
@@ skipping 48 matching lines @@
   ignore_root_layer_flings = proto.ignore_root_layer_flings();
   scheduled_raster_task_limit = proto.scheduled_raster_task_limit();
   use_occlusion_for_tile_prioritization =
       proto.use_occlusion_for_tile_prioritization();
   verify_property_trees = proto.verify_property_trees();
   use_property_trees = proto.use_property_trees();
   image_decode_tasks_enabled = proto.image_decode_tasks_enabled();
   use_compositor_animation_timelines =
       proto.use_compositor_animation_timelines();
   wait_for_beginframe_interval = proto.wait_for_beginframe_interval();
+  use_mouse_wheel_gestures = proto.use_mouse_wheel_gestures();
   max_staging_buffer_usage_in_bytes = proto.max_staging_buffer_usage_in_bytes();
   memory_policy_.FromProtobuf(proto.memory_policy());
   initial_debug_state.FromProtobuf(proto.initial_debug_state());
 
   for (int i = 0; i < proto.use_image_texture_targets_size(); ++i)
     use_image_texture_targets.push_back(proto.use_image_texture_targets(i));
 }
 
 SchedulerSettings LayerTreeSettings::ToSchedulerSettings() const {
   SchedulerSettings scheduler_settings;
   scheduler_settings.use_external_begin_frame_source =
       use_external_begin_frame_source;
   scheduler_settings.main_frame_before_activation_enabled =
       main_frame_before_activation_enabled;
   scheduler_settings.timeout_and_draw_when_animation_checkerboards =
       timeout_and_draw_when_animation_checkerboards;
   scheduler_settings.using_synchronous_renderer_compositor =
       using_synchronous_renderer_compositor;
   scheduler_settings.throttle_frame_production = wait_for_beginframe_interval;
   scheduler_settings.background_frame_interval =
       base::TimeDelta::FromSecondsD(1.0 / background_animation_rate);
   return scheduler_settings;
 }
 
 }  // namespace cc