Refactor unit tests for the base library to use GTest.

test/base-unittests/base-unittests.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.
+
+{
+  'variables': {
+    'v8_code': 1,
+  },
+  'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
+  'targets': [
+    {
+      'target_name': 'base-unittests',
+      'type': 'executable',
+      'dependencies': [
+        '../../testing/gmock.gyp:gmock_main',
+        '../../testing/gtest.gyp:gtest',
+        '../../tools/gyp/v8.gyp:v8_libbase',
+      ],
+      'include_dirs': [
+        '../..',
+      ],
+      'sources': [  ### gcmole(all) ###
+        'cpu-unittest.cc',
+        'platform/condition-variable-unittest.cc',
+        'platform/mutex-unittest.cc',
+        'platform/platform-unittest.cc',
+        'platform/time-unittest.cc',
+        'utils/random-number-generator-unittest.cc',
+      ],
+    },
+  ],
+}