Fixing flaky overscroll and touch exploration mode browser tests.

ui/aura/window_event_dispatcher.cc

Index: ui/aura/window_event_dispatcher.cc
diff --git a/ui/aura/window_event_dispatcher.cc b/ui/aura/window_event_dispatcher.cc
index 0f4715066fad90842b2a2f2eea23251e15ad2909..d10187d6ce8257bf90502ca7e800e5ffd5959ed3 100644
--- a/ui/aura/window_event_dispatcher.cc
+++ b/ui/aura/window_event_dispatcher.cc
@@ -194,6 +194,10 @@ void WindowEventDispatcher::ReleasePointerMoves() {
   TRACE_EVENT_ASYNC_END0("ui", "WindowEventDispatcher::HoldPointerMoves", this);
 }
 
+bool WindowEventDispatcher::HoldingPointerMovesForTesting() {
+  return move_hold_count_ > 0;
+}
+
 gfx::Point WindowEventDispatcher::GetLastMouseLocationInRoot() const {
   gfx::Point location = Env::GetInstance()->last_mouse_location();
   client::ScreenPositionClient* client =