Make sure send one WebTouchEvent ack per ui::TouchEvent

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index 69fe661283393fdb0315cda39e74758e57cc291c..a2dc961a5d59017e878a156c323572d41244d986 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -509,6 +509,10 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   // Called when the parent window hierarchy for our window changes.
   void ParentHierarchyChanged();
 
+  // Reset unchange touch point to StateStationary for touchmove and
+  // touchcancel.
+  void SetTouchPointStateStationary(blink::WebTouchEvent* event, int touch_id);
+
   // The model object.
   RenderWidgetHostImpl* host_;