Add a mimeHandler extension API.

extensions/extensions.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 432 matching lines @@
         'browser/api/hid/hid_connection_resource.cc',
         'browser/api/hid/hid_connection_resource.h',
         'browser/api/hid/hid_device_manager.cc',
         'browser/api/hid/hid_device_manager.h',
         'browser/api/management/management_api.cc',
         'browser/api/management/management_api.h',
         'browser/api/management/management_api_delegate.h',
         'browser/api/management/management_api_constants.cc',
         'browser/api/management/management_api_constants.h',
         'browser/api/messaging/native_message_host.cc',
+        'browser/api/mime_handler_private/mime_handler_private.cc',
+        'browser/api/mime_handler_private/mime_handler_private.h',
         'browser/api/power/power_api.cc',
         'browser/api/power/power_api.h',
         'browser/api/power/power_api_manager.cc',
         'browser/api/power/power_api_manager.h',
         'browser/api/printer_provider_internal/printer_provider_internal_api.cc',
         'browser/api/printer_provider_internal/printer_provider_internal_api.h',
         'browser/api/runtime/runtime_api.cc',
         'browser/api/runtime/runtime_api.h',
         'browser/api/runtime/runtime_api_delegate.cc',
         'browser/api/runtime/runtime_api_delegate.h',
@@ skipping 848 matching lines @@
       'conditions': [
         ['OS=="win" and win_use_allocator_shim==1', {
           'dependencies': [
             '../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ]
 }