Ensure that when themes in desktop chrome AURA on Windows use the opaque browser frame view.

chrome/browser/ui/views/frame/browser_frame_common_win.h

+// Copyright (c) 2013 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 CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_COMMON_WIN_H_
+#define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_COMMON_WIN_H_
+
+class BrowserView;
+class NativeWidget;
+
+namespace ui {
+class ThemeProvider;
+}
+
+namespace views {
+namespace internal {
+class NativeWidgetPrivate;
+}
+}
+
+namespace chrome {
+// Returns true if we should use the native i.e. Glass browser frame.
+// for the BrowserView passed in.
+bool ShouldUseNativeFrame(
+    const views::internal::NativeWidgetPrivate* native_widget,
+    const BrowserView* browser_view,
+    const ui::ThemeProvider* theme_provider);
+}
+
+#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_FRAME_COMMON_WIN_H_