Move have_wheel_event_handlers to WebLayerTreeView.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 57b62f880ed30c978e7f608cab61187810e7be72..ce9df702bb89b85f5673da2c585e9e8d7af1322a 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -60,7 +60,6 @@ LayerImpl::LayerImpl(LayerTreeImpl* tree_impl,
       scroll_clip_layer_id_(Layer::INVALID_ID),
       main_thread_scrolling_reasons_(
           MainThreadScrollingReason::kNotScrollingOnMain),
-      have_wheel_event_handlers_(false),
       have_scroll_event_handlers_(false),
       scroll_blocks_on_(SCROLL_BLOCKS_ON_NONE),
       user_scrollable_horizontal_(true),
@@ -563,7 +562,7 @@ InputHandler::ScrollStatus LayerImpl::TryScroll(
   }
 
   if ((type == InputHandler::WHEEL || type == InputHandler::ANIMATED_WHEEL) &&
-      have_wheel_event_handlers() &&
+      layer_tree_impl_->have_wheel_event_handlers() &&
       effective_block_mode & SCROLL_BLOCKS_ON_WHEEL_EVENT) {
     TRACE_EVENT0("cc", "LayerImpl::tryScroll: Failed WheelEventHandlers");
     scroll_status.thread = InputHandler::SCROLL_ON_MAIN_THREAD;
@@ -622,7 +621,6 @@ void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   layer->SetBackgroundFilters(background_filters());
   layer->SetMasksToBounds(masks_to_bounds_);
   layer->set_main_thread_scrolling_reasons(main_thread_scrolling_reasons_);
-  layer->SetHaveWheelEventHandlers(have_wheel_event_handlers_);
   layer->SetHaveScrollEventHandlers(have_scroll_event_handlers_);
   layer->SetScrollBlocksOn(scroll_blocks_on_);
   layer->SetNonFastScrollableRegion(non_fast_scrollable_region_);
@@ -773,8 +771,6 @@ base::DictionaryValue* LayerImpl::LayerTreeAsJson() const {
   if (scrollable())
     result->SetBoolean("Scrollable", true);
 
-  if (have_wheel_event_handlers_)
-    result->SetBoolean("WheelHandler", have_wheel_event_handlers_);
   if (have_scroll_event_handlers_)
     result->SetBoolean("ScrollHandler", have_scroll_event_handlers_);
   if (!touch_event_handler_region_.IsEmpty()) {
@@ -1742,13 +1738,6 @@ void LayerImpl::AsValueInto(base::trace_event::TracedValue* state) const {
     touch_event_handler_region_.AsValueInto(state);
     state->EndArray();
   }
-  if (have_wheel_event_handlers_) {
-    gfx::Rect wheel_rect(bounds());
-    Region wheel_region(wheel_rect);
-    state->BeginArray("wheel_event_handler_region");
-    wheel_region.AsValueInto(state);
-    state->EndArray();
-  }
   if (have_scroll_event_handlers_) {
     gfx::Rect scroll_rect(bounds());
     Region scroll_region(scroll_rect);