Allocator shim skeleton + Linux impl behind a build flag

base/base.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
     'base.gypi',
   ],
   'targets': [
     {
       'target_name': 'base',
       'type': '<(component)',
       'toolsets': ['host', 'target'],
       'variables': {
         'base_target': 1,
         'enable_wexit_time_destructors': 1,
         'optimize': 'max',
       },
       'dependencies': [
         'allocator/allocator.gyp:allocator',
+        'allocator/allocator.gyp:allocator_features',
         'base_debugging_flags#target',
         'base_static',
         'base_build_date#target',
         '../testing/gtest.gyp:gtest_prod',
         '../third_party/modp_b64/modp_b64.gyp:modp_b64',
         'third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
       ],
       # TODO(gregoryd): direct_dependent_settings should be shared with the
       #  64-bit target, but it doesn't work due to a bug in gyp
       'direct_dependent_settings': {
@@ skipping 192 matching lines @@
               ],
             }],
           ],
         }],
         ['OS=="ios"', {
           'sources!': [
             'sync_socket.h',
             'sync_socket_posix.cc',
           ]
         }],
+        ['use_experimental_allocator_shim==1', {
+          'dependencies': [ 'allocator/allocator.gyp:unified_allocator_shim']
+        }],
       ],
       'sources': [
         'auto_reset.h',
         'linux_util.cc',
         'linux_util.h',
         'message_loop/message_pump_android.cc',
         'message_loop/message_pump_android.h',
         'message_loop/message_pump_glib.cc',
         'message_loop/message_pump_glib.h',
         'message_loop/message_pump_io_ios.cc',
@@ skipping 464 matching lines @@
               'dependencies': [
                 '../third_party/icu/icu.gyp:icudata',
               ],
             }],
           ],
         }, {  # OS != "win"
           'dependencies': [
             'third_party/libevent/libevent.gyp:libevent'
           ],
         }],
+        ['use_experimental_allocator_shim==1', {
+          'sources': [ 'allocator/allocator_shim_unittest.cc']
+        }],
       ],  # conditions
       'target_conditions': [
         ['OS == "ios" and _toolset != "host"', {
           'sources/': [
             # Pull in specific Mac files for iOS (which have been filtered out
             # by file name rules).
             ['include', '^mac/bind_objc_block_unittest\\.mm$'],
             ['include', '^mac/foundation_util_unittest\\.mm$',],
             ['include', '^mac/objc_property_releaser_unittest\\.mm$'],
             ['include', '^mac/scoped_nsobject_unittest\\.mm$'],
@@ skipping 952 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }