Add InfoBar delegate for previews

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 486 matching lines @@
       'browser/prerender/prerender_message_filter.cc',
       'browser/prerender/prerender_message_filter.h',
       'browser/prerender/prerender_origin.cc',
       'browser/prerender/prerender_origin.h',
       'browser/prerender/prerender_resource_throttle.cc',
       'browser/prerender/prerender_resource_throttle.h',
       'browser/prerender/prerender_tab_helper.cc',
       'browser/prerender/prerender_tab_helper.h',
       'browser/prerender/prerender_util.cc',
       'browser/prerender/prerender_util.h',
+      'browser/previews/previews_infobar_delegate.cc',
+      'browser/previews/previews_infobar_delegate.h',
       'browser/process_resource_usage.cc',
       'browser/process_resource_usage.h',
       'browser/process_singleton.h',
       'browser/process_singleton_win.cc',
       'browser/profiles/incognito_mode_policy_handler.cc',
       'browser/profiles/incognito_mode_policy_handler.h',
       'browser/push_messaging/push_messaging_app_identifier.cc',
       'browser/push_messaging/push_messaging_app_identifier.h',
       'browser/push_messaging/push_messaging_constants.cc',
       'browser/push_messaging/push_messaging_constants.h',
@@ skipping 3814 matching lines @@
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
             'common',
           ],
         },
       ],
     }],
   ],
 }