Add Hide to app menu.

apps/app_shim/app_shim_quit_interactive_uitest_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.
 
 // Tests behavior when quitting apps with app shims.
 
 #import <Cocoa/Cocoa.h>
 
 #include "apps/app_shim/app_shim_host_manager_mac.h"
 #include "apps/app_shim/extension_app_shim_handler_mac.h"
@@ skipping 21 matching lines @@
            const std::string& app_id,
            ExtensionAppShimHandler* handler)
       : profile_path_(profile_path),
         app_id_(app_id),
         handler_(handler) {}
 
   virtual void OnAppLaunchComplete(AppShimLaunchResult result) OVERRIDE {}
   virtual void OnAppClosed() OVERRIDE {
     handler_->OnShimClose(this);
   }
+  virtual void OnAppHide() OVERRIDE {}
   virtual void OnAppRequestUserAttention() OVERRIDE {}
   virtual base::FilePath GetProfilePath() const OVERRIDE {
     return profile_path_;
   }
   virtual std::string GetAppId() const OVERRIDE { return app_id_; }
 
  private:
   base::FilePath profile_path_;
   std::string app_id_;
   ExtensionAppShimHandler* handler_;
@@ skipping 65 matching lines @@
             atStart:NO];
 
   // This will time out if the event above does not terminate Chrome.
   content::RunMessageLoop();
 
   EXPECT_FALSE(handler_->FindHost(profile(), extension_id_));
   EXPECT_TRUE(browser_shutdown::IsTryingToQuit());
 }
 
 }  // namespace apps