chromeos: Fix pixelated icons in app list and launcher (part 2) (by xiyuan)

chrome/browser/extensions/extension_icon_image_delegate.h

+// Copyright (c) 2012 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_EXTENSIONS_EXTENSION_ICON_IMAGE_DELEGATE_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_DELEGATE_H_
+
+class ExtensionIconImage;
+
+class ExtensionIconImageDelegate {
+ public:
+  // Invoked when |image| is updated with image reps for additional scale
+  // factors.
+  virtual void OnExtensionIconImageChanged(ExtensionIconImage* image) = 0;
+
+ protected:
+  virtual ~ExtensionIconImageDelegate() {}
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ICON_IMAGE_DELEGATE_H_