Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/gfx/screen_type_delegate.h

Index: ui/gfx/screen_type_delegate.h
diff --git a/ui/gfx/screen_type_delegate.h b/ui/gfx/screen_type_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..4d9f116aedd6f8dce1d8643a7b550879735bd738
--- /dev/null
+++ b/ui/gfx/screen_type_delegate.h
@@ -0,0 +1,32 @@
+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_GFX_SCREEN_TYPE_DELEGATE_H_
+#define UI_GFX_SCREEN_TYPE_DELEGATE_H_
+
+#include "ui/gfx/native_widget_types.h"
+
+namespace gfx {
+
+enum GFX_EXPORT ScreenType {
+  SCREEN_TYPE_NATIVE = 0,
+#if defined(OS_CHROMEOS)
+  SCREEN_TYPE_ALTERNATE = SCREEN_TYPE_NATIVE,
+#else
+  SCREEN_TYPE_ALTERNATE,
+#endif
+  SCREEN_TYPE_LAST = SCREEN_TYPE_ALTERNATE,
+};
+
+class GFX_EXPORT ScreenTypeDelegate {
+ public:
+  virtual ~ScreenTypeDelegate() {}
+
+  // Determines which ScreenType a given |view| belongs to.
+  virtual ScreenType GetScreenTypeForNativeView(NativeView view) = 0;
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_SCREEN_TYPE_DELEGATE_H_