Adds views::corewm::WMState to install common state

ash/test/ash_test_helper.h

Index: ash/test/ash_test_helper.h
diff --git a/ash/test/ash_test_helper.h b/ash/test/ash_test_helper.h
index ab0b8a2d599a4ca2c1a60ddddc56d05d1b2d5b7c..706cfeb520de35a27f2a389902ef4e3e1133cc72 100644
--- a/ash/test/ash_test_helper.h
+++ b/ash/test/ash_test_helper.h
@@ -20,6 +20,12 @@ namespace ui {
 class ScopedAnimationDurationScaleMode;
 }  // namespace ui
 
+namespace views {
+namespace corewm {
+class WMState;
+}
+}
+
 namespace ash {
 namespace test {
 
@@ -62,6 +68,8 @@ class AshTestHelper {
   // Owned by ash::AcceleratorController
   TestScreenshotDelegate* test_screenshot_delegate_;
 
+  scoped_ptr<views::corewm::WMState> wm_state_;
+
   // Check if DBus Thread Manager was initialized here.
   bool dbus_thread_manager_initialized_;