Add a flag to dump IPC messages sent from the renderer to the browser.

chrome/chrome_common.gypi

 # Copyright (c) 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': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 221 matching lines @@
       'common/importer/importer_data_types.h',
       'common/importer/importer_type.h',
       'common/importer/importer_url_row.cc',
       'common/importer/importer_url_row.h',
       'common/importer/profile_import_process_messages.cc',
       'common/importer/profile_import_process_messages.h',
       'common/importer/profile_import_process_param_traits_macros.h',
       'common/importer/safari_importer_utils.h',
       'common/importer/safari_importer_utils.mm',
     ],
+    'chrome_common_ipc_fuzzer_sources': [
+      'common/external_ipc_dumper.h',
+      'common/external_ipc_dumper.cc',
+    ],
     'chrome_common_service_process_sources': [
       'common/service_messages.h',
       'common/service_process_util.cc',
       'common/service_process_util.h',
       'common/service_process_util_linux.cc',
       'common/service_process_util_mac.mm',
       'common/service_process_util_posix.cc',
       'common/service_process_util_posix.h',
       'common/service_process_util_win.cc',
     ],
@@ skipping 153 matching lines @@
           ],
           'include_dirs': [
             '<(DEPTH)/breakpad/src',
           ],
         }],
         ['disable_nacl==0', {
           'dependencies': [
             '<(DEPTH)/components/nacl.gyp:nacl_common',
           ],
         }],
+        ['enable_ipc_fuzzer==1', {
+          'sources': [ '<@(chrome_common_ipc_fuzzer_sources)' ],
+        }],
         ['enable_plugins==1', {
           'dependencies': [
             '<(DEPTH)/third_party/adobe/flash/flash_player.gyp:flapper_version_h',
           ],
           'sources': [
             'common/pepper_flash.cc',
             'common/pepper_flash.h',
             'common/ppapi_utils.cc',
             'common/ppapi_utils.h',
           ],
@@ skipping 249 matching lines @@
         'common/safe_browsing/csd.proto'
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',
         'proto_out_dir': 'chrome/common/safe_browsing',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }