Giving focus to an app shim brings windows belonging to that app to the foreground.

apps/app_shim/app_shim_host_manager_mac.mm

 // Copyright 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.
 
 #include "apps/app_shim/app_shim_host_manager_mac.h"
 
 #include "apps/app_shim/app_shim_host_mac.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/public/browser/browser_thread.h"
-#include "chrome/common/mac/app_mode_common.h"
+#import "chrome/common/mac/app_mode_common.h"

[koz (OOO until 15th September), 2013/03/18 03:33:12]

Is this necessary? Other places #include this file.

[jeremya, 2013/03/18 04:54:05]

I guess not. Removed.

 
 using content::BrowserThread;
 
 namespace {
 
 void CreateAppShimHost(const IPC::ChannelHandle& handle) {
   // AppShimHost takes ownership of itself.
   (new AppShimHost)->ServeChannel(handle);
 }
 
@@ skipping 36 matching lines @@
     const IPC::ChannelHandle& handle) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&CreateAppShimHost, handle));
 }
 
 void AppShimHostManager::OnListenError() {
   // TODO(jeremya): set a timeout and attempt to reconstruct the channel.
 }