Update isolate files for content tests and enable swarming for them.

content/content_tests.gypi

 # Copyright (c) 2013 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': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 922 matching lines @@
             '../ui/ozone/ozone.gyp:ozone_base',
           ],
         }],
       ],
     },
   ],
   'conditions': [
     ['test_isolation_mode != "noop"', {
       'targets': [
         {
+          'target_name': 'content_browsertests_run',
+          'type': 'none',
+          'dependencies': [
+            'content_browsertests',
+          ],
+          'includes': [
+            '../build/isolate.gypi',
+            'content_browsertests.isolate',
+          ],
+          'sources': [
+            'content_browsertests.isolate',
+          ],
+        },
+        {
           'target_name': 'content_unittests_run',
           'type': 'none',
           'dependencies': [
             'content_unittests',
           ],
           'includes': [
             '../build/isolate.gypi',
             'content_unittests.isolate',
           ],
           'sources': [
@@ skipping 896 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }