Enable whitelist generation for all builds.

build/toolchain/gcc_compile_wrapper.py

Index: build/toolchain/gcc_compile_wrapper.py
diff --git a/build/toolchain/gcc_compile_wrapper.py b/build/toolchain/gcc_compile_wrapper.py
new file mode 100755
index 0000000000000000000000000000000000000000..0e04dde3d3f36a16a47086298762d7aecdbede2d
--- /dev/null
+++ b/build/toolchain/gcc_compile_wrapper.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+# Copyright 2016 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.
+
+"""Runs a compilation command.
+
+This script exists to avoid using complex shell commands in
+gcc_toolchain.gni's tool("cxx") and tool("cc") in case the host running the
+compiler does not have a POSIX-like shell (e.g. Windows).
+"""
+
+import argparse
+import sys
+
+import wrapper_utils
+
+
+def main():
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('--resource-whitelist',
+                      help='Generate a resource whitelist for this target.',
+                      metavar='PATH')
+  parser.add_argument('command', nargs=argparse.REMAINDER,
+                      help='Compilation command')
+  args = parser.parse_args()
+
+  returncode, stderr = wrapper_utils.CaptureCommandStderr(
+      wrapper_utils.CommandToRun(args.command))
+
+  used_resources = wrapper_utils.ExtractResourceIdsFromPragmaWarnings(stderr)
+  sys.stderr.write(stderr)
+
+  if args.resource_whitelist:
+    with open(args.resource_whitelist, 'w') as f:
+      if used_resources:
+        f.write('\n'.join(str(resource) for resource in used_resources))
+        f.write('\n')
+
+
+  return returncode
+
+if __name__ == "__main__":
+  sys.exit(main())