[Cronet] Enforce ARMv7 Cronet doesn't inadvertently use ARM Neon instructions

components/cronet/tools/enforce_no_neon.py

Index: components/cronet/tools/enforce_no_neon.py
diff --git a/components/cronet/tools/enforce_no_neon.py b/components/cronet/tools/enforce_no_neon.py
new file mode 100755
index 0000000000000000000000000000000000000000..f0add628a431f7d25dfd4976e4abc3e2b56504d5
--- /dev/null
+++ b/components/cronet/tools/enforce_no_neon.py
@@ -0,0 +1,22 @@
+#!/usr/bin/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.
+
+"""
+enforce_no_neon.py - Enforce modules do not contain ARM Neon instructions.

[mef, 2016/06/28 16:46:24]

nit: I don't think this script really enforces no neon, it just checks for its
presence.

[pauljensen, 2016/06/29 12:47:42]

Done.

+"""
+
+import os
+import sys
+
+def main():
+  if len(sys.argv) != 3:
+    print 'Usage: ' + os.path.basename(sys.argv[0]) + \
+        ' path/to/ARM/objdump files/to/check/*.o'
+    return 1
+  return os.system(sys.argv[1] + ' -d --no-show-raw-insn ' +
+      sys.argv[2] + ' | grep -q "vld[1-9]\\|vst[1-9]"')
+
+if __name__ == '__main__':
+  sys.exit(0 if main() != 0 else -1)