Route calls to tcmalloc MallocExtension through allocator agnostic interface

base/allocator/allocator.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': {
     'jemalloc_dir': '../../third_party/jemalloc/chromium',
     'tcmalloc_dir': '../../third_party/tcmalloc/chromium',
   },
   'targets': [
@@ skipping 409 matching lines @@
             '<(tcmalloc_dir)/src/heap-checker-bcad.cc',
             '<(tcmalloc_dir)/src/heap-checker.cc',
           ],
           # Disable the heap checker in tcmalloc.
           'defines': [
             'NO_HEAP_CHECK',
           ],
         }],
       ],
     },
+    {
+      # This library is linked in to libbase and allocator_unittests.
+      # It can't depend on either and nothing else should depend on it -
+      # all other code should use the interfaced provided by libbase.
+      'target_name': 'allocator_extension_thunks',
+      'type': 'static_library',
+      'sources': [
+        'allocator_extension_thunks.cc',
+        'allocator_extension_thunks.h',
       ],
+      'toolsets': ['host', 'target'],
+      'include_dirs': [
+        '../../'
+      ],
+    },
+   ],
   'conditions': [
     ['OS=="win"', {
       'targets': [
         {
           'target_name': 'libcmt',
           'type': 'none',
           'actions': [
             {
               'action_name': 'libcmt',
               'inputs': [
                 'prep_libc.sh',
               ],
               'outputs': [
                 '<(SHARED_INTERMEDIATE_DIR)/allocator/libcmt.lib',
               ],
               'action': [
                 './prep_libc.sh',
                 '$(VCInstallDir)lib',
                 '<(SHARED_INTERMEDIATE_DIR)/allocator',
               ],
             },
           ],
         },
         {
           'target_name': 'allocator_unittests',
           'type': 'executable',
           'dependencies': [
             'allocator',
+            'allocator_extension_thunks',
             '../../testing/gtest.gyp:gtest',
           ],
           'include_dirs': [
             '.',
             '<(tcmalloc_dir)/src/base',
             '<(tcmalloc_dir)/src',
             '../..',
           ],
           'sources': [
             'allocator_unittests.cc',
             '../profiler/alternate_timer.cc',
             '../profiler/alternate_timer.h',
           ],
         },
+        {
+          'target_name': 'allocator_extension_thunks_win64',
+          'type': 'static_library',
+          'sources': [
+            'allocator_extension_thunks.cc',
+            'allocator_extension_thunks.h',
+          ],
+          'toolsets': ['host', 'target'],
+          'include_dirs': [
+            '../../'
+          ],
+          'configurations': {
+            'Common_Base': {
+              'msvs_target_platform': 'x64',
+            },
+          },
+        },
       ],
     }],
   ],
 }