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

chrome/browser/managed_mode/managed_user_theme.h

Index: chrome/browser/managed_mode/managed_user_theme.h
diff --git a/chrome/browser/managed_mode/managed_user_theme.h b/chrome/browser/managed_mode/managed_user_theme.h
new file mode 100644
index 0000000000000000000000000000000000000000..5d6321a1b8ada6870091d6b3c70923c7d33b1db9
--- /dev/null
+++ b/chrome/browser/managed_mode/managed_user_theme.h
@@ -0,0 +1,28 @@
+// 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_provider.h"
+#include "ui/base/resource/resource_bundle.h"
+
+class ManagedUserTheme : public CustomThemeProvider {
+ public:
+  ManagedUserTheme();
+
+  // Overridden from CustomThemeProvider:
+  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();
+
+  ui::ResourceBundle& rb_;
+
+  DISALLOW_COPY_AND_ASSIGN(ManagedUserTheme);
+};
+
+#endif  // CHROME_BROWSER_MANAGED_MODE_MANAGED_USER_THEME_H_