Communicate whether passive event listeners exist to cc.

cc/proto/layer.proto

Index: cc/proto/layer.proto
diff --git a/cc/proto/layer.proto b/cc/proto/layer.proto
index 41b3f2d8086e319e7672214fa9500e90bb84cefd..7418a5e56d7970e96ee712cc1c91d9d71133370d 100644
--- a/cc/proto/layer.proto
+++ b/cc/proto/layer.proto
@@ -85,7 +85,7 @@ message BaseLayerProperties {
   // 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;
@@ -123,11 +123,13 @@ message BaseLayerProperties {
   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 {