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

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

Index: chrome/browser/ui/views/frame/taskbar_decorator.cc
diff --git a/chrome/browser/ui/views/theme_image_mapper.cc b/chrome/browser/ui/views/frame/taskbar_decorator.cc
similarity index 60%
copy from chrome/browser/ui/views/theme_image_mapper.cc
copy to chrome/browser/ui/views/frame/taskbar_decorator.cc
index 14ea0612356d0ce46990cb11b7ec7bd1a41a1f76..7bef2a4fa9e77b46ae05badcc7002f9f0583f0fc 100644
--- a/chrome/browser/ui/views/theme_image_mapper.cc
+++ b/chrome/browser/ui/views/frame/taskbar_decorator.cc
@@ -2,12 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/views/theme_image_mapper.h"
+#include "chrome/browser/ui/views/frame/taskbar_decorator.h"
 
 namespace chrome {
 
-int MapThemeImage(HostDesktopType desktop_type, int resource) {
-  return resource;
+void DrawTaskbarDecoration(gfx::NativeWindow window, const gfx::Image* image) {
 }
 
 }  // namespace chrome