Refactor common unit test code.

testing/gmock.gyp

 # Copyright 2014 the V8 project 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': 'gmock',
       'type': 'static_library',
       'dependencies': [
@@ skipping 29 matching lines @@
         'gmock/include',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'gmock/include',  # So that gmock headers can find themselves.
         ],
       },
       'export_dependent_settings': [
         'gtest.gyp:gtest',
       ],
+      'conditions': [
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
+        }],
+      ],
     },
     {
       'target_name': 'gmock_main',
       'type': 'static_library',
       'dependencies': [
         'gmock',
       ],
       'sources': [
         'gmock/src/gmock_main.cc',
       ],
     },
   ],
 }