Disable the touch ack timeout for touch-action:none

content/browser/renderer_host/input/input_router_impl.h

Index: content/browser/renderer_host/input/input_router_impl.h
diff --git a/content/browser/renderer_host/input/input_router_impl.h b/content/browser/renderer_host/input/input_router_impl.h
index 68b52f0193bb46b6b0648ee05dbda3047c0a06eb..ed39947ed071a0f91381f12226a5b08f8bde7467 100644
--- a/content/browser/renderer_host/input/input_router_impl.h
+++ b/content/browser/renderer_host/input/input_router_impl.h
@@ -125,7 +125,7 @@ private:
   void OnMsgMoveCaretAck();
   void OnSelectRangeAck();
   void OnHasTouchEventHandlers(bool has_handlers);
-  void OnSetTouchAction(content::TouchAction touch_action);
+  void OnSetTouchAction(TouchAction touch_action);
 
   // Indicates the source of an ack provided to |ProcessInputEventAck()|.
   // The source is tracked by |current_ack_source_|, which aids in ack routing.
@@ -174,6 +174,12 @@ private:
   void SimulateTouchGestureWithMouse(
       const MouseEventWithLatencyInfo& mouse_event);
 
+  // Called when a touch timeout-affecting bit has changed, in turn toggling the
+  // touch ack timeout feature of the |touch_event_queue_| as appropriate. Input
+  // to that determination includes current view properties, the allowed touch
+  // action and the command-line configured |touch_ack_timeout_supported_|.
+  void UpdateTouchAckTimeoutEnabled();
+
   bool IsInOverscrollGesture() const;
 
   int routing_id() const { return routing_id_; }
@@ -232,9 +238,12 @@ private:
   KeyQueue key_queue_;
 
   // Whether touch ack timeout handling has been enabled via the command line.
-  bool touch_ack_timeout_enabled_;
+  bool touch_ack_timeout_supported_;
   size_t touch_ack_timeout_delay_ms_;
 
+  // Cached flags from |OnViewUpdated()|, defaults to 0.
+  int current_view_flags_;
+
   // The source of the ack within the scope of |ProcessInputEventAck()|.
   // Defaults to ACK_SOURCE_NONE.
   AckSource current_ack_source_;