Pull in gmock for standalone pdfium builds.

testing/gmock.gyp

+# Copyright 2015 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': 'gmock',
+      'type': 'static_library',
+      'dependencies': [
+        'gtest.gyp:gtest',
+      ],
+      'sources': [
+        # Sources based on files in r173 of gmock.
+        'gmock/include/gmock/gmock-actions.h',
+        'gmock/include/gmock/gmock-cardinalities.h',
+        'gmock/include/gmock/gmock-generated-actions.h',
+        'gmock/include/gmock/gmock-generated-function-mockers.h',
+        'gmock/include/gmock/gmock-generated-matchers.h',
+        'gmock/include/gmock/gmock-generated-nice-strict.h',
+        'gmock/include/gmock/gmock-matchers.h',
+        'gmock/include/gmock/gmock-spec-builders.h',
+        'gmock/include/gmock/gmock.h',
+        'gmock/include/gmock/internal/gmock-generated-internal-utils.h',
+        'gmock/include/gmock/internal/gmock-internal-utils.h',
+        'gmock/include/gmock/internal/gmock-port.h',
+        'gmock/src/gmock-cardinalities.cc',
+        'gmock/src/gmock-internal-utils.cc',
+        'gmock/src/gmock-matchers.cc',
+        'gmock/src/gmock-spec-builders.cc',
+        'gmock/src/gmock.cc',
+        'gmock_mutant.h',  # gMock helpers
+      ],
+      'include_dirs': [
+        'gmock',
+        'gmock/include',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          'gmock/include',  # So that gmock headers can find themselves.
+        ],
+      },
+      'export_dependent_settings': [
+        'gtest.gyp:gtest',
+      ],
+    },
+    {
+      'target_name': 'gmock_main',
+      'type': 'static_library',
+      'dependencies': [
+        'gmock',
+      ],
+      'sources': [
+        'gmock/src/gmock_main.cc',
+      ],
+    },
+  ],
+}