Fixing flaky overscroll and touch exploration mode browser tests.

ui/aura/window_event_dispatcher.h

Index: ui/aura/window_event_dispatcher.h
diff --git a/ui/aura/window_event_dispatcher.h b/ui/aura/window_event_dispatcher.h
index 79ba3c7b2cbc17cf5c45f2994d6c21658cb90cc4..581fbe2c757a3a4958369ff172be1de74b5015f7 100644
--- a/ui/aura/window_event_dispatcher.h
+++ b/ui/aura/window_event_dispatcher.h
@@ -46,6 +46,10 @@ class TestScreen;
 class WindowTargeter;
 class WindowTreeHost;
 
+namespace test {
+class WindowEventDispatcherTestApi;
+}
+
 // WindowEventDispatcher orchestrates event dispatch within a window tree
 // owned by WindowTreeHost. WTH also owns the WED.
 // TODO(beng): In progress, remove functionality not directly related to
@@ -118,6 +122,7 @@ class AURA_EXPORT WindowEventDispatcher : public ui::EventProcessor,
   FRIEND_TEST_ALL_PREFIXES(WindowEventDispatcherTest,
                            KeepTranslatedEventInRoot);
 
+  friend class test::WindowEventDispatcherTestApi;
   friend class Window;
   friend class TestScreen;