Adding partially circular memory buffer wrapper.

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',
     '../build/temp_gyp/googleurl.gyp:googleurl',
     '../components/tracing.gyp:tracing',
     '../media/media.gyp:media',
@@ skipping 129 matching lines @@
     'common/child_process.cc',
     'common/child_process.h',
     'common/child_process_host_impl.cc',
     'common/child_process_host_impl.h',
     'common/child_process_messages.h',
     'common/child_process_sandbox_support_impl_linux.cc',
     'common/child_process_sandbox_support_impl_linux.h',
     'common/child_process_sandbox_support_impl_shm_linux.cc',
     'common/child_thread.cc',
     'common/child_thread.h',
+    'common/circular_memory_buffer.cc',
+    'common/circular_memory_buffer.h',
     'common/clipboard_messages.cc',
     'common/clipboard_messages.h',
     'common/content_constants_internal.cc',
     'common/content_constants_internal.h',
     'common/content_export.h',
     'common/content_ipc_logging.cc',
     'common/content_message_generator.cc',
     'common/content_message_generator.h',
     'common/content_param_traits.cc',
     'common/content_param_traits.h',
@@ skipping 424 matching lines @@
         '..\\third_party\\directxsdk\\files\\Redist\\<(input)',
         '<(output)',
         '<(PRODUCT_DIR)',
         ],
         'msvs_cygwin_shell': 1,
       },
      ]
     }],
   ],
 }