[exp] Browser-side fling.

content/common/input/web_input_event_traits.cc

Index: content/common/input/web_input_event_traits.cc
diff --git a/content/common/input/web_input_event_traits.cc b/content/common/input/web_input_event_traits.cc
index fa9f433a1d7fd538a6e1cd23ce6e0424e98f6cd9..b6e22dc4acfc0a1924e28a07d7d2482cd32bfd38 100644
--- a/content/common/input/web_input_event_traits.cc
+++ b/content/common/input/web_input_event_traits.cc
@@ -147,6 +147,7 @@ void Coalesce(const WebTouchEvent& event_to_coalesce, WebTouchEvent* event) {
 
 bool CanCoalesce(const WebGestureEvent& event_to_coalesce,
                  const WebGestureEvent& event) {
+  CHECK_NE(WebInputEvent::GestureScrollUpdateWithoutPropagation, event.type);
   if (event.type != event_to_coalesce.type ||
       event.sourceDevice != event_to_coalesce.sourceDevice ||
       event.modifiers != event_to_coalesce.modifiers)
@@ -277,6 +278,7 @@ const char* WebInputEventTraits::GetName(WebInputEvent::Type type) {
     CASE_TYPE(GestureScrollBegin);
     CASE_TYPE(GestureScrollEnd);
     CASE_TYPE(GestureScrollUpdate);
+    CASE_TYPE(GestureScrollUpdateWithoutPropagation);
     CASE_TYPE(GestureFlingStart);
     CASE_TYPE(GestureFlingCancel);
     CASE_TYPE(GestureShowPress);