Add context popup menu support for content shell[GTK].

content/content_shell.gypi

 # 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.
 
 {
   'variables': {
     'content_shell_product_name': 'Content Shell',
   },
   'targets': [
     {
@@ skipping 82 matching lines @@
         'shell/shell_render_process_observer.cc',
         'shell/shell_render_process_observer.h',
         'shell/shell_resource_context.cc',
         'shell/shell_resource_context.h',
         'shell/shell_resource_dispatcher_host_delegate.cc',
         'shell/shell_resource_dispatcher_host_delegate.h',
         'shell/shell_switches.cc',
         'shell/shell_switches.h',
         'shell/shell_url_request_context_getter.cc',
         'shell/shell_url_request_context_getter.h',
+        'shell/shell_web_contents_view_delegate_creator.h',
+        'shell/shell_web_contents_view_delegate_gtk.cc',
+        'shell/shell_web_contents_view_delegate.h',
         'shell/webkit_test_runner.cc',
         'shell/webkit_test_runner.h',
         'shell/webkit_test_runner_bindings.cc',
         'shell/webkit_test_runner_bindings.h',
         'shell/webkit_test_runner_host.cc',
         'shell/webkit_test_runner_host.h',
       ],
       'msvs_settings': {
         'VCLinkerTool': {
           'SubSystem': '2',  # Set /SUBSYSTEM:WINDOWS
@@ skipping 559 matching lines @@
               'dependencies': [
                 'content_java',
               ],
             }
           ],
         },
       ],
     }],  # OS=="android"
   ]
 }