More work to make ash_unittests pass when we require context.

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index e2399f21efec1240093de403aaddb2177d7f465f..2827d918400b79864dba84be1693a9405f0e18db 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -629,7 +629,7 @@ bool AcceleratorController::PerformAction(int action,
     case SHOW_OAK:
       if (CommandLine::ForCurrentProcess()->HasSwitch(
               switches::kAshEnableOak)) {
-        oak::ShowOakWindow();
+        oak::ShowOakWindowWithContext(Shell::GetPrimaryRootWindow());
         return true;
       }
       break;