android: Use UIResource for overscroll glow

ui/base/android/system_ui_resource_manager.h

+// Copyright 2014 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_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_
+#define UI_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_
+
+#include "ui/base/ui_base_export.h"
+
+namespace ui {
+
+class SystemUIResourceLayer;
+
+class UI_BASE_EXPORT SystemUIResourceManager {
+ public:
+  enum Type { OVERSCROLL_EDGE, OVERSCROLL_GLOW };
+
+  virtual ~SystemUIResourceManager() {}
+
+  virtual void Subscribe(Type type, SystemUIResourceLayer* layer) = 0;
+  virtual void Unsubscribe(Type type, SystemUIResourceLayer* layer) = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_ANDROID_SYSTEM_UI_RESOURCE_MANAGER_H_