Implement support for touch-action: pan-x/pan-y in chromium

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 6485c45a935cf6996180e8f767d0345b8cdb5294..35e6fa78560c216bbc293384c4f1218d1ec20b4f 100644
--- a/content/browser/renderer_host/input/touch_action_filter.h
+++ b/content/browser/renderer_host/input/touch_action_filter.h
@@ -25,13 +25,19 @@ public:
 
   // Returns true if the supplied gesture event should be dropped based on
   // the current touch-action state.
-  bool FilterGestureEvent(const blink::WebGestureEvent& gesture_event);
+  bool FilterGestureEvent(blink::WebGestureEvent* gesture_event);
 
   // Called when a set-touch-action message is received from the renderer
   // for a touch start event that is currently in flight.
   void OnSetTouchAction(content::TouchAction touch_action);
 
+  // Return the intersection of two TouchAction values.
+  static TouchAction Intersect(TouchAction ta1, TouchAction ta2);
+
 private:
+  bool ShouldSuppressScroll(const blink::WebGestureEvent& gesture_event);
+  bool FilterGestureEnd();
+
   // Whether GestureScroll events should be discarded due to touch-action.
   bool drop_scroll_gesture_events_;