linux_aura: run IconLoader::ReadIcon on the UI thread.

chrome/browser/icon_loader_win.cc

 // 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.
 
 #include "chrome/browser/icon_loader.h"
 
 #include <windows.h>
 #include <shellapi.h>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/thread.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/icon_util.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/size.h"
 
 // static
 IconGroupID IconLoader::ReadGroupIDFromFilepath(
     const base::FilePath& filepath) {
   if (!IsIconMutableFromFilepath(filepath))
     return filepath.Extension();
   return filepath.value();
 }
 
+// static
 bool IconLoader::IsIconMutableFromFilepath(const base::FilePath& filepath) {
   return filepath.MatchesExtension(L".exe") ||
          filepath.MatchesExtension(L".dll") ||
          filepath.MatchesExtension(L".ico");
 }
 
+// static
+content::BrowserThread::ID IconLoader::ReadIconThreadID() {
+  return content::BrowserThread::FILE;
+}
+
 void IconLoader::ReadIcon() {
   int size = 0;
   switch (icon_size_) {
     case IconLoader::SMALL:
       size = SHGFI_SMALLICON;
       break;
     case IconLoader::NORMAL:
       size = 0;
       break;
     case IconLoader::LARGE:
@@ skipping 16 matching lines @@
       image_skia.MakeThreadSafe();
       image_.reset(new gfx::Image(image_skia));
       DestroyIcon(file_info.hIcon);
     }
   }
 
   // Always notify the delegate, regardless of success.
   target_message_loop_->PostTask(FROM_HERE,
       base::Bind(&IconLoader::NotifyDelegate, this));
 }