Add a dependency to mesa.gyp:osmesa to chrome_run.

chrome/chrome_exe.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.
 
 {
   'targets': [
     {
       'target_name': 'chrome',
       'type': 'none',
       'dependencies': [ 'chrome_initial', ],
@@ skipping 656 matching lines @@
         }],
       ],
     }],
     ['test_isolation_mode != "noop"', {
       'targets': [
         {
           'target_name': 'chrome_run',
           'type': 'none',
           'dependencies': [
             'chrome',
+            # Runtime dependencies
+            '../third_party/mesa/mesa.gyp:osmesa',
           ],
           'includes': [
             '../build/isolate.gypi',
           ],
           'sources': [
             'chrome.isolate',
           ],
           'conditions': [
             ['OS=="win"', {
               'dependencies': [
                 'chrome_nacl_win64',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }