Add a buildflag to use the handle verifier in a per module mode.

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#target',
         'base_debugging_flags#target',
+        'base_win_features#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': {
         'include_dirs': [
@@ skipping 988 matching lines @@
       'target_name': 'base_debugging_flags',
       'includes': [ '../build/buildflag_header.gypi' ],
       'variables': {
         'buildflag_header_path': 'base/debug/debugging_flags.h',
         'buildflag_flags': [
           'ENABLE_PROFILING=<(profiling)',
         ],
       },
     },
     {
+      # GN version: //base/win:base_win_features
+      # Since this generates a file, it most only be referenced in the target

[chrisha, 2016/05/13 18:44:54]

must*

(could fix this where it was copied from too)

[Sébastien Marchand, 2016/05/18 13:39:08]

Done.

+      # toolchain or there will be multiple rules that generate the header.
+      # When referenced from a target that might be compiled in the host
+      # toolchain, always refer to 'base_win_features#target'.
+      'target_name': 'base_win_features',
+      'includes': [ '../build/buildflag_header.gypi' ],
+      'variables': {
+        'buildflag_header_path': 'base/win/base_features.h',
+        'buildflag_flags': [
+          'ENABLE_HANDLE_VERIFIER=<(enable_handle_verifier)',
+        ],
+      },
+    },
+    {
       'type': 'none',
       'target_name': 'base_build_date',
       'hard_dependency': 1,
       'actions': [{
         'action_name': 'generate_build_date_headers',
         'inputs': [
           '<(DEPTH)/build/write_build_date_header.py',
           '<(DEPTH)/build/util/LASTCHANGE'
         ],
         'outputs': [ '<(SHARED_INTERMEDIATE_DIR)/base/generated_build_date.h' ],
@@ skipping 684 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }