Attempt to fix ash tests on Chrome OS valgrind

ui/wm/core/cursor_manager.cc

Index: ui/wm/core/cursor_manager.cc
diff --git a/ui/wm/core/cursor_manager.cc b/ui/wm/core/cursor_manager.cc
index 607614b61311860b889149d478a043c46755f5f3..08c9643b74e293eb895eb136b14a8f59c0752e2d 100644
--- a/ui/wm/core/cursor_manager.cc
+++ b/ui/wm/core/cursor_manager.cc
@@ -87,6 +87,11 @@ CursorManager::CursorManager(scoped_ptr<NativeCursorManager> delegate)
 CursorManager::~CursorManager() {
 }
 
+// static
+void CursorManager::ResetCursorVisibilityStateForTest() {
+  last_cursor_visibility_state_ = true;
+}
+
 void CursorManager::SetCursor(gfx::NativeCursor cursor) {
   state_on_unlock_->set_cursor(cursor);
   if (cursor_lock_count_ == 0 &&