Expose native, desktop and mobile gesture detection defaults

content/browser/renderer_host/input/web_input_event_util.cc

Index: content/browser/renderer_host/input/web_input_event_util.cc
diff --git a/content/browser/renderer_host/input/web_input_event_util.cc b/content/browser/renderer_host/input/web_input_event_util.cc
index 81fc359e63c6be3f0d8cc079ce8f463f7b06099d..d25a80df0e4889c8c6081556e23ca9d6099d63b9 100644
--- a/content/browser/renderer_host/input/web_input_event_util.cc
+++ b/content/browser/renderer_host/input/web_input_event_util.cc
@@ -255,7 +255,8 @@ void UpdateWindowsKeyCodeAndKeyIdentifier(blink::WebKeyboardEvent* event,
 }
 
 blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
-    const ui::MotionEvent& event) {
+    const ui::MotionEvent& event,
+    bool may_cause_scrolling) {
   COMPILE_ASSERT(static_cast<int>(MotionEvent::MAX_TOUCH_POINT_COUNT) ==
                      static_cast<int>(blink::WebTouchEvent::touchesLengthCap),
                  inconsistent_maximum_number_of_active_touch_points);
@@ -266,6 +267,7 @@ blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
       ToWebInputEventType(event.GetAction()),
       (event.GetEventTime() - base::TimeTicks()).InSecondsF(),
       &result);
+  result.defaultActionMayCauseScrolling = may_cause_scrolling;
 
   result.modifiers = EventFlagsToWebEventModifiers(event.GetFlags());
   result.touchesLength =