Move IPC fuzzer switches and helpers from chrome/common to content/common.

content/content_common.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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../cc/cc.gyp:cc',
     '../cc/ipc/cc_ipc.gyp:cc_ipc',
     '../components/tracing.gyp:tracing',
@@ skipping 642 matching lines @@
       ],
     }, {  # use_ozone!=1
       'sources!': [
         'common/cursors/webcursor_ozone.cc',
         'common/font_list_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.cc',
         'common/gpu/gpu_memory_buffer_factory_ozone_native_pixmap.h',
       ],
     }],
+    ['enable_ipc_fuzzer==1', {
+      'sources': [
+        'public/common/external_ipc_dumper.cc',
+        'public/common/external_ipc_dumper.h',
+      ],
+    }],
   ],
 }