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.cc

+// 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.
+
+#include "chrome/browser/ui/views/frame/browser_frame_common_win.h"
+
+#include "chrome/browser/ui/views/frame/browser_view.h"
+#include "ui/base/theme_provider.h"
+#include "ui/views/widget/native_widget_private.h"
+
+namespace chrome {
+
+bool ShouldUseNativeFrame(
+    const views::internal::NativeWidgetPrivate* native_widget,
+    const BrowserView* browser_view,
+    const ui::ThemeProvider* theme_provider) {
+  // App panel windows draw their own frame.
+  if (browser_view->IsPanel())
+    return false;
+
+  // We don't theme popup or app windows, so regardless of whether or not a
+  // theme is active for normal browser windows, we don't want to use the custom
+  // frame for popups/apps.
+  if (!browser_view->IsBrowserTypeNormal() &&
+      native_widget->ShouldUseNativeFrame()) {
+    return true;
+  }
+  // Otherwise, we use the native frame when we're told we should by the theme
+  // provider (e.g. no custom theme is active).
+  return theme_provider->ShouldUseNativeFrame();
+}
+
+}  // namespace browser
+