Communicate whether passive event listeners exist to cc.

cc/proto/layer.proto

 // Copyright 2015 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.
 
 syntax = "proto2";
 
 import "display_list_recording_source.proto";
 import "layer_position_constraint.proto";
 import "point3f.proto";
 import "pointf.proto";
@@ skipping 67 matching lines @@
   optional Vector2dF offset_to_transform_parent = 7;
   optional bool double_sided = 8;
   optional bool draws_content = 9;
   optional bool hide_layer_and_subtree = 10;
   optional bool has_render_surface = 11;
   // TODO(nyquist): Add support for FilterOperation. See crbug.com/541321.
   // repeated FilterOperation filters = 12;
   // repeated FilterOperation background_filters = 13;
   optional bool masks_to_bounds = 14;
   optional bool should_scroll_on_main_thread = 15;
-  optional bool have_wheel_event_handlers = 16;
+  optional int32 wheel_event_properties = 16;
   optional bool have_scroll_event_handlers = 17;
   optional Region non_fast_scrollable_region = 18;
   optional Region touch_event_handler_region = 19;
   optional int32 scroll_blocks_on = 20;
   optional bool contents_opaque = 21;
   optional float opacity = 22;
   optional SkXfermode.Mode blend_mode = 23;
   optional bool is_root_for_isolated_group = 24;
   optional PointF position = 25;
   optional bool is_container_for_fixed_position_layers = 26;
@@ skipping 17 matching lines @@
 
   optional int32 clip_parent_id = 42;
   repeated int32 clip_children_ids = 43;
 
   optional ScrollOffset scroll_offset = 44;
   optional Vector2dF scroll_compensation_adjustment = 45;
 
   optional Rect update_rect = 46;
   optional bool stacking_order_changed = 47;
 
+  optional int32 touch_event_properties = 48;
+
   // TODO(nyquist): Figure out what to do with LayerAnimationController.
-  // optional LayerAnimationController layer_animation_controller = 48;
+  // optional LayerAnimationController layer_animation_controller = 49;
 
   // TODO(nyquist): Figure out what to do with FrameTimingRequests.
-  // repeated FrameTimingRequest frame_timing_requests = 49;
+  // repeated FrameTimingRequest frame_timing_requests = 50;
 }
 
 message PictureLayerProperties {
   optional DisplayListRecordingSource recording_source = 1;
   optional Region invalidation = 2;
   optional Rect last_updated_visible_layer_rect = 3;
   optional bool is_mask = 4;
   optional bool nearest_neighbor = 5;
 
   optional int64 update_source_frame_number = 6;
 }