Separate out logic to handle different category/group of context menu items from RVContextMenu class

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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2408 matching lines @@
         'browser/sync_file_system/sync_service_state.h',
         'browser/sync_file_system/sync_status_code.cc',
         'browser/sync_file_system/sync_status_code.h',
         'browser/sync_file_system/sync_task.h',
         'browser/sync_file_system/sync_task_manager.cc',
         'browser/sync_file_system/sync_task_manager.h',
         'browser/sync_file_system/syncable_file_system_util.cc',
         'browser/sync_file_system/syncable_file_system_util.h',
         'browser/tab_contents/background_contents.cc',
         'browser/tab_contents/background_contents.h',
+        'browser/tab_contents/menu_category_app_mode.cc',
+        'browser/tab_contents/menu_category_app_mode.h',
+        'browser/tab_contents/menu_category_base.cc',
+        'browser/tab_contents/menu_category_base.h',
+        'browser/tab_contents/menu_category_extension_popup.cc',
+        'browser/tab_contents/menu_category_extension_popup.h',
+        'browser/tab_contents/menu_category_factory.cc',
+        'browser/tab_contents/menu_category_factory.h',
+        'browser/tab_contents/menu_category_guest.cc',
+        'browser/tab_contents/menu_category_guest.h',
+        'browser/tab_contents/menu_category_panel.cc',
+        'browser/tab_contents/menu_category_panel.h',
+        'browser/tab_contents/menu_category_platform_app.cc',
+        'browser/tab_contents/menu_category_platform_app.h',
         'browser/tab_contents/navigation_metrics_recorder.cc',
         'browser/tab_contents/navigation_metrics_recorder.h',
         'browser/tab_contents/render_view_context_menu.cc',
         'browser/tab_contents/render_view_context_menu.h',
         'browser/tab_contents/render_view_context_menu_observer.cc',
         'browser/tab_contents/render_view_context_menu_observer.h',
         'browser/tab_contents/retargeting_details.h',
         'browser/tab_contents/tab_util.cc',
         'browser/tab_contents/tab_util.h',
         'browser/tab_contents/spellchecker_submenu_observer.h',
@@ skipping 1309 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }