Moves calling TaskbarList::SetOverlayIcon to a separate thread. It

chrome/browser/ui/views/frame/taskbar_decorator.h

+// Copyright (c) 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_UI_VIEWS_FRAME_TASKBAR_DECORATOR_H_
+#define CHROME_BROWSER_UI_VIEWS_FRAME_TASKBAR_DECORATOR_H_
+
+#include "ui/gfx/native_widget_types.h"
+
+namespace gfx {
+class Image;
+}
+
+namespace chrome {
+
+// Draws a scaled version of the avatar in |image| on the taskbar button
+// associated with top level, visible |window|. Currently only implemented
+// for Windows 7 and above.
+void DrawTaskbarDecoration(gfx::NativeWindow window, const gfx::Image* image);
+
+}
+
+#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_TASKBAR_DECORATOR_H_