MacViews: Fix ViewTest.HandleAccelerator by faking window activation

ui/views/test/views_test_helper.h

Index: ui/views/test/views_test_helper.h
diff --git a/ui/views/test/views_test_helper.h b/ui/views/test/views_test_helper.h
index d2796b37a1a07bcef81b1ce1c8901a292c9f2c31..e653d358c26a23ccaa0881c91c5cfbe930cf6fda 100644
--- a/ui/views/test/views_test_helper.h
+++ b/ui/views/test/views_test_helper.h
@@ -39,6 +39,10 @@ class ViewsTestHelper {
   // RootWindow. Everywhere else, NULL.
   virtual gfx::NativeWindow GetContext();
 
+  // Causes window activations to be "faked" for desktop widgets. Only
+  // implemented on Mac. See ViewsTestBase::EnableMacFakeWindowActivation().
+  virtual void EnableFakeWindowActivation();
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ViewsTestHelper);
 };