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..cea1af73af6e63f10526e2e5ac7ad3044d0f6c1b
--- /dev/null
+++ b/build/toolchain/gcc_compile_wrapper.py
@@ -0,0 +1,48 @@
+#!/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('--whitelist-file',
+                      help='File containing whitelisted resources for target.',
+                      metavar='FILE')
+  parser.add_argument('--whitelist', action='store_true',
+                      help='Indicates that whitelisting should be performed.')
+  parser.add_argument('command', nargs=argparse.REMAINDER,
+                      help='Compilation command')
+  args = parser.parse_args()
+
+  returncode, _, stderr = wrapper_utils.GetCommandOutput(
+      wrapper_utils.CommandToRun(args.command))
+  if returncode != 0 or not args.whitelist:

[agrieve, 2016/07/27 01:42:27]

Need to write stderr before returning.

[estevenson, 2016/07/28 21:56:45]

Done.

+    return returncode
+
+  used_resources = wrapper_utils.GetResourceIdsInPragmaWarnings(stderr)
+  stderr = wrapper_utils.FilterUnknownPragmas(stderr)
+  if stderr:
+    sys.stderr.write(stderr)
+
+  if used_resources:

[agrieve, 2016/07/27 01:42:27]

If a file used to have a resource, and is changed to not have one, this needs to
delete the existing whitelist file (or replace it with an empty file)

[estevenson, 2016/07/28 21:56:45]

Done.

+    with open(args.whitelist_file, 'w') as f:
+      f.write('\n'.join(str(resource) for resource in used_resources))
+      f.write('\n')
+
+  return returncode
+
+if __name__ == "__main__":
+  sys.exit(main())