Always reset touch action at the beginning of a new gesture sequence

content/browser/renderer_host/input/touch_action_filter.h

Index: content/browser/renderer_host/input/touch_action_filter.h
diff --git a/content/browser/renderer_host/input/touch_action_filter.h b/content/browser/renderer_host/input/touch_action_filter.h
index 17cf59eeb2fee612a805d84232b3e9834cc0dcaf..c44d611394111a7ba83c5767aa7d9a65c903f34b 100644
--- a/content/browser/renderer_host/input/touch_action_filter.h
+++ b/content/browser/renderer_host/input/touch_action_filter.h
@@ -31,6 +31,12 @@ public:
   // for a touch start event that is currently in flight.
   void OnSetTouchAction(content::TouchAction touch_action);
 
+  // Must be called before the first touch of the touch sequence is sent to the
+  // renderer. This will be before any gestures produced by the touch sequence
+  // are sent to the renderer, because to dispatch a gesture we must know the
+  // disposition of the touch events which contributed to it.
+  void OnTouchSequenceStart();
+
   // Return the intersection of two TouchAction values.
   static TouchAction Intersect(TouchAction ta1, TouchAction ta2);