Add trace-viewer to third party and redirect about:tracing to that implementation.

chrome/chrome_resources.gyp

 # 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.
 {
   'variables': {
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
     'repack_locales_cmd': ['python', 'tools/build/repack_locales.py'],
   },
   'targets': [
     {
@@ skipping 96 matching lines @@
             'grit_grd_file': 'renderer/renderer_resources.grd',
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
         {
           'action_name': 'extensions_api_resources',
           'variables': {
             'grit_grd_file': 'common/extensions_api_resources.grd',
           },
           'includes': [ '../build/grit_action.gypi' ],
-        }
+        },
+        {
+          'action_name': 'tracing_resources',
+          'variables': {
+            'grit_grd_file': '../third_party/trace-viewer/src/tracing.grd',
+          },
+          'includes': [ '../build/grit_action.gypi' ],
+        },
+
       ],
       'includes': [ '../build/grit_target.gypi' ],
     },
     {
       # TODO(mark): It would be better if each static library that needed
       # to run grit would list its own .grd files, but unfortunately some
       # of the static libraries currently have circular dependencies among
       # generated headers.
       'target_name': 'chrome_strings',
       'type': 'none',
@@ skipping 271 matching lines @@
                   'files': ['<@(default_apps_list)']
                 },
               ],
             }],
           ], # conditions
         }], # end OS != "mac"
       ], # conditions
     },
   ], # targets
 }