Add missing dependencies.

components/components_tests.gyp

 # Copyright 2014 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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 863 matching lines @@
         'components.gyp:url_fixer',
         'components.gyp:variations',
         'components.gyp:variations_http_provider',
         'components.gyp:wallpaper',
         'components.gyp:web_resource',
         'components.gyp:web_resource_test_support',
         'components_resources.gyp:components_resources',
         'components_strings.gyp:components_strings',
         'components_tests_pak',
         'mime_util/mime_util.gyp:mime_util',
+        # Only needed at runtime.
+        '../third_party/mesa/mesa.gyp:osmesa',
       ],
       'conditions': [
         ['enable_rlz_support==1', {
           'sources': [
             '<@(rlz_unittest_sources)',
           ],
           'dependencies': [
             '../net/net.gyp:net_test_support',
             '../rlz/rlz.gyp:test_support_rlz',
             'components.gyp:rlz',
@@ skipping 651 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'components_unittests',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }