Add custom default theme support and create a managed user default theme.

chrome/browser/managed_mode/managed_user_theme.h

+// Copyright 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_MANAGED_MODE_MANAGED_USER_THEME_H_
+#define CHROME_BROWSER_MANAGED_MODE_MANAGED_USER_THEME_H_
+
+#include "chrome/browser/themes/custom_theme_supplier.h"
+
+namespace gfx {
+class Image;
+}
+
+// This theme is used as a default theme for supervised users. It uses a light
+// blue as frame color, and defines color properties for the avatar label.
+class ManagedUserTheme : public CustomThemeSupplier {
+ public:
+  ManagedUserTheme();
+
+  // Overridden from CustomThemeSupplier:
+  virtual bool GetColor(int id, SkColor* color) const OVERRIDE;
+  virtual gfx::Image GetImageNamed(int id) OVERRIDE;
+  virtual bool HasCustomImage(int id) const OVERRIDE;
+
+ private:
+  virtual ~ManagedUserTheme();
+
+  DISALLOW_COPY_AND_ASSIGN(ManagedUserTheme);
+};
+
+#endif  // CHROME_BROWSER_MANAGED_MODE_MANAGED_USER_THEME_H_