android: Use UIResource for overscroll glow

content/browser/android/system_ui_resource.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 CONTENT_BROWSER_ANDROID_SYSTEM_UI_RESOURCE_H_
+#define CONTENT_BROWSER_ANDROID_SYSTEM_UI_RESOURCE_H_
+
+#include "cc/resources/ui_resource_client.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/android/ui_resource_client_android.h"
+
+namespace ui {
+class UIResourceProvider;
+}
+
+namespace content {
+
+class SystemUIResourceClient {
+ public:
+  virtual void OnUIResourceIdChanged() = 0;
+  virtual ~SystemUIResourceClient() {}
+};
+
+class SystemUIResource : public ui::UIResourceClientAndroid {
+ public:
+  static scoped_ptr<SystemUIResource> Create(const SkBitmap& bitmap,
+                                             ui::UIResourceProvider* provider);
+
+  virtual ~SystemUIResource();
+
+  // cc::UIResourceClient implementation.
+  virtual cc::UIResourceBitmap GetBitmap(cc::UIResourceId uid,
+                                         bool resource_lost) OVERRIDE;
+
+  // ui::UIResourceClientAndroid implementation.
+  virtual void UIResourceIsInvalid() OVERRIDE;
+
+  cc::UIResourceId id();
+  void Load();
+  void SetClient(SystemUIResourceClient* client);
+
+ private:
+  SystemUIResource(const SkBitmap& bitmap, ui::UIResourceProvider* provider);
+
+  SkBitmap bitmap_;
+  cc::UIResourceId id_;
+  ui::UIResourceProvider* provider_;
+  SystemUIResourceClient* client_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemUIResource);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_SYSTEM_UI_RESOURCE_H_