Remove GTEST_LANG_CXX11 and switch to C++11 on gtest and gmock

This CL removes GTEST_LANG_CXX11=0 from build configuration, and let
gtest detect whether C++11 is available. And to make it work, this CL
injects a custom gmock-port.h to provide missing type_traits.

BUG=630299

Review-Url: https://codereview.chromium.org/2174663002
Cr-Commit-Position: refs/heads/master@{#407360}

build/secondary/testing/gmock/BUILD.gn

@@ -4,7 +4,10 @@
 
 config("gmock_config") {
   # Gmock headers need to be able to find themselves.
-  include_dirs = [ "include" ]
+  include_dirs = [
+    "//testing/gmock_custom",
+    "include",
+  ]
 }
 
 static_library("gmock") {

build/secondary/testing/gtest/BUILD.gn

@@ -14,9 +14,6 @@ config("gtest_config") {
     # In order to allow regex matches in gtest to be shared between Windows
     # and other systems, we tell gtest to always use it's internal engine.
     "GTEST_HAS_POSIX_RE=0",
-
-    # Chrome doesn't support / require C++11, yet.
-    "GTEST_LANG_CXX11=0",
   ]
 
   # Gtest headers need to be able to find themselves.

remoting/remoting_test.gypi

@@ -223,9 +223,6 @@
       'defines': [
         'VERSION=<(version_full)',
       ],
-      'include_dirs': [
-        '../testing/gmock/include',
-      ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'base/auto_thread_task_runner_unittest.cc',
@@ -575,9 +572,6 @@
           'defines': [
             'VERSION=<(version_full)',
           ],
-          'include_dirs': [
-            '../testing/gmock/include',
-          ],
           'sources': [
             'base/run_all_unittests.cc',
             'test/codec_perftest.cc',

testing/gmock.gyp

@@ -36,11 +36,12 @@
         'gmock/src/gmock-all.cc',  # Not needed by our build.
       ],
       'include_dirs': [
-        'gmock',
+        'gmock_custom',
         'gmock/include',
       ],
       'all_dependent_settings': {
         'include_dirs': [
+          'gmock_custom',
           'gmock/include',  # So that gmock headers can find themselves.
         ],
       },

testing/gmock_custom/gmock/internal/custom/gmock-port.h

+// Copyright 2016 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.
+
+#ifndef TESTING_GMOCK_CUSTOM_GMOCK_INTERNAL_CUSTOM_GMOCK_PORT_H_
+#define TESTING_GMOCK_CUSTOM_GMOCK_INTERNAL_CUSTOM_GMOCK_PORT_H_
+
+#include <type_traits>
+
+namespace std {
+
+// Provide alternative implementation of std::is_default_constructible for
+// old, pre-4.7 of libstdc++, where is_default_constructible is missing.
+// <20120322 below implies pre-4.7.0. In addition we blacklist several version
+// that released after 4.7.0 from pre-4.7.0 branch. 20120702 implies 4.5.4, and
+// 20121127 implies 4.6.4.
+#if defined(__GLIBCXX__) &&   \
+  (__GLIBCXX__ < 20120322 ||  \
+   __GLIBCXX__ == 20120702 || \
+   __GLIBCXX__ == 20121127)
+template <typename T>
+using is_default_constructible = std::is_constructible<T>;
+#endif
+
+}
+
+#endif  // TESTING_GMOCK_CUSTOM_GMOCK_INTERNAL_CUSTOM_GMOCK_PORT_H_

testing/gtest.gyp

@@ -25,8 +25,6 @@
         # In order to allow regex matches in gtest to be shared between Windows
         # and other systems, we tell gtest to always use it's internal engine.
         'GTEST_HAS_POSIX_RE=0',
-        # Chrome doesn't support / require C++11, yet.
-        'GTEST_LANG_CXX11=0',
       ],
       'all_dependent_settings': {
         'include_dirs': [
@@ -34,7 +32,6 @@
         ],
         'defines': [
           'GTEST_HAS_POSIX_RE=0',
-          'GTEST_LANG_CXX11=0',
         ],
       },
       'conditions': [

testing/gtest_nacl.gyp

@@ -36,20 +36,10 @@
             # Windows and other systems, we tell gtest to always use it's
             # internal engine.
             'GTEST_HAS_POSIX_RE=0',
-            'GTEST_LANG_CXX11=0',
-            # gtest isn't able to figure out when RTTI is disabled for gcc
-            # versions older than 4.3.2, and assumes it's enabled.  Our Mac
-            # and Linux builds disable RTTI, and cannot guarantee that the
-            # compiler will be 4.3.2. or newer.  The Mac, for example, uses
-            # 4.2.1 as that is the latest available on that platform.  gtest
-            # must be instructed that RTTI is disabled here, and for any
-            # direct dependents that might include gtest headers.
-            'GTEST_HAS_RTTI=0',
           ],
           'all_dependent_settings': {
             'defines': [
               'GTEST_HAS_POSIX_RE=0',
-              'GTEST_LANG_CXX11=0',
             ],
             'link_flags': [
               '-lgtest_nacl',
@@ -58,7 +48,6 @@
           'direct_dependent_settings': {
             'defines': [
               'UNIT_TEST',
-              'GTEST_HAS_RTTI=0',
             ],
             'include_dirs': [
               'gtest/include',  # So that gtest headers can find themselves.

ui/events/events_unittests.gyp

@@ -65,9 +65,6 @@
         'win/event_utils_win_unittest.cc',
         'x/events_x_unittest.cc',
       ],
-      'include_dirs': [
-        '../../testing/gmock/include',
-      ],
       'conditions': [
         ['use_x11==1', {
           'dependencies': [