Enable mojo js tests which depend on mojom.js files in gen/.

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.
 
 {
   'targets': [
     {
       'target_name': 'layouttest_support_content',
       'type': 'static_library',
       'conditions': [
@@ skipping 1002 matching lines @@
             'content_shell_pak',
             'test_support_content',
             'web_ui_test_mojo_bindings',
             '../base/base.gyp:test_support_base',
             '../gin/gin.gyp:gin',
             '../gpu/gpu.gyp:gpu',
             '../ipc/ipc.gyp:test_support_ipc',
             '../media/media.gyp:media_test_support',
             '../media/media.gyp:shared_memory_support',
             '../mojo/mojo.gyp:mojo_bindings',
+            '../mojo/mojo.gyp:mojo_common_test_support',
             '../mojo/mojo.gyp:mojo_environment_chromium',
             '../mojo/mojo.gyp:mojo_service_manager',
             '../mojo/mojo.gyp:mojo_system_impl',
             '../net/net.gyp:net_test_support',
             '../ppapi/ppapi_internal.gyp:ppapi_host',
             '../ppapi/ppapi_internal.gyp:ppapi_ipc',
             '../ppapi/ppapi_internal.gyp:ppapi_proxy',
             '../ppapi/ppapi_internal.gyp:ppapi_shared',
             '../ppapi/ppapi_internal.gyp:ppapi_unittest_shared',
             '../testing/gmock.gyp:gmock',
@@ skipping 789 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }