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

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index 7725fb656ad68b6e6e19a20aaf2d882306afcf12..f5908ef78ff8eb7ed3e479995b158236e1239569 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -24,6 +24,7 @@
         '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',
@@ -1032,6 +1033,21 @@
       },
     },
     {
+      # 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,