Add C++11 compatible base::hash function object.

test/unittests/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': 'unittests',
       'type': 'executable',
       'variables': {
         'optimize': 'max',
       },
       'dependencies': [
         '../../testing/gmock.gyp:gmock',
         '../../testing/gtest.gyp:gtest',
         '../../tools/gyp/v8.gyp:v8_libplatform',
       ],
       'include_dirs': [
         '../..',
       ],
       'sources': [  ### gcmole(all) ###
         'base/bits-unittest.cc',
         'base/cpu-unittest.cc',
         'base/division-by-constant-unittest.cc',
         'base/flags-unittest.cc',
+        'base/functional-unittest.cc',
         'base/platform/condition-variable-unittest.cc',
         'base/platform/mutex-unittest.cc',
         'base/platform/platform-unittest.cc',
         'base/platform/semaphore-unittest.cc',
         'base/platform/time-unittest.cc',
         'base/sys-info-unittest.cc',
         'base/utils/random-number-generator-unittest.cc',
         'compiler/change-lowering-unittest.cc',
         'compiler/common-operator-unittest.cc',
         'compiler/compiler-test-utils.h',
@@ skipping 68 matching lines @@
           'direct_dependent_settings': {
             'cflags!': [
               '-pedantic',
             ],
           },
         }],
       ],
     },
   ],
 }