Enables ScreenPinningController for mash/mus

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 65e0d720779c6f362f0d5fbd37d0f794db18c68e..673e3d69722527ae90725971608c53bb42d9468e 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -1142,6 +1142,7 @@ test("ash_content_unittests") {
 source_set("common_unittests") {
   testonly = true
   sources = [
+    "accelerators/accelerator_commands_unittest.cc",
     "accelerators/accelerator_controller_unittest.cc",
     "accelerators/accelerator_filter_unittest.cc",
     "accelerators/spoken_feedback_toggler_unittest.cc",
@@ -1242,6 +1243,7 @@ source_set("common_unittests") {
     "wm/panels/panel_window_resizer_unittest.cc",
     "wm/root_window_layout_manager_unittest.cc",
     "wm/screen_dimmer_unittest.cc",
+    "wm/screen_pinning_controller_unittest.cc",
     "wm/session_state_animator_impl_unittest.cc",
     "wm/stacking_controller_unittest.cc",
     "wm/system_modal_container_layout_manager_unittest.cc",
@@ -1301,9 +1303,6 @@ source_set("common_unittests") {
 
 test("ash_unittests") {
   sources = [
-    # TODO: move to common_unittests. Fails because of http://crbug.com/622486.
-    "accelerators/accelerator_commands_unittest.cc",
-
     # TODO: move to common_unittests. Fails because of http://crbug.com/557401.
     "accelerators/magnifier_key_scroller_unittest.cc",
 
@@ -1391,9 +1390,6 @@ test("ash_unittests") {
     # TODO: mash doesn't support CursorManager. http://crbug.com/631103.
     "wm/resize_shadow_and_cursor_unittest.cc",
 
-    # TODO: mash doesn't support pinning. http://crbug.com/622486
-    "wm/screen_pinning_controller_unittest.cc",
-
     # TODO: mash doesn't support SetFirstDisplayAsInternalDisplay(), which all
     # the tests in this file use. http://crbug.com/698091.
     "wm/system_gesture_event_filter_unittest.cc",