Don't pass touches to gesture recognizer for async acks.

ui/aura/test/aura_test_utils.h

Index: ui/aura/test/aura_test_utils.h
diff --git a/ui/aura/test/aura_test_utils.h b/ui/aura/test/aura_test_utils.h
index ec94b3c3dbc6ca6931085eb4e249da1cdcd1327b..33d43099b59c086e6add40ee0dbf3aa3240f00c3 100644
--- a/ui/aura/test/aura_test_utils.h
+++ b/ui/aura/test/aura_test_utils.h
@@ -7,6 +7,8 @@
 
 #include "base/macros.h"
 
+#include "ui/aura/window_event_dispatcher.h"
+
 namespace gfx {
 class Point;
 }
@@ -16,6 +18,18 @@ class WindowTreeHost;
 
 namespace test {
 
+class WindowTreeHostTestApi {
+ public:
+  explicit WindowTreeHostTestApi(WindowTreeHost* host);
+  const gfx::Point& last_cursor_request_position_in_host();
+  void set_dispatcher(WindowEventDispatcher* dispatcher);
+
+ private:
+  WindowTreeHost* host_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostTestApi);
+};
+
 const gfx::Point& QueryLatestMousePositionRequestInHost(WindowTreeHost* host);
 
 }  // namespace test