Check whether a touch point hits touch event handler regions in root layer

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index f6b753915070bb426cf9fcb728db7a9f9d36ec29..f5ca6aa86132aadfe72eb4af65a1733f35aa7522 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -357,10 +357,13 @@ bool LayerTreeHostImpl::haveTouchEventHandlersAt(const gfx::Point& viewportPoint
 
     // First find out which layer was hit from the saved list of visible layers
     // in the most recent frame.
-    LayerImpl* layerImplHitByPointInTouchHandlerRegion = LayerTreeHostCommon::findLayerThatIsHitByPointInTouchHandlerRegion(deviceViewportPoint, m_renderSurfaceLayerList);
+    LayerImpl* layerImpl = LayerTreeHostCommon::findLayerThatIsHitByPoint(deviceViewportPoint, m_renderSurfaceLayerList);
 
-    if (layerImplHitByPointInTouchHandlerRegion)
-      return true;
+    // Walk up the hierarchy and look for a layer with a touch event handler region that the given point hits.
+    for (; layerImpl; layerImpl = layerImpl->parent()) {
+      if (LayerTreeHostCommon::layerHasTouchEventHandlersAt(deviceViewportPoint,layerImpl))
+          return true;
+    }
 
     return false;
 }