Add proto for TLS error assistant, refactor proto generator code.

chrome/browser/resources/ssl/tls_error_assistant/gen_tls_error_assistant_proto.py

Index: chrome/browser/resources/ssl/tls_error_assistant/gen_tls_error_assistant_proto.py
diff --git a/chrome/browser/resources/ssl/tls_error_assistant/gen_tls_error_assistant_proto.py b/chrome/browser/resources/ssl/tls_error_assistant/gen_tls_error_assistant_proto.py
new file mode 100755
index 0000000000000000000000000000000000000000..f57a69b7acb35c5759d3d9e1d44f9b5b51a76b3f
--- /dev/null
+++ b/chrome/browser/resources/ssl/tls_error_assistant/gen_tls_error_assistant_proto.py
@@ -0,0 +1,40 @@
+#!/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.
+
+"""
+ Convert the ASCII tls_error_assistant.asciipb proto into a binary resource.
+"""
+
+import os
+import sys
+
+proto_generator_path = os.path.normpath(os.path.join(os.path.abspath(__file__),

[Nathan Parker, 2016/12/10 00:56:50]

Add a comment describing this magic incantation

[meacer, 2016/12/13 02:30:16]

Done.

+    *[os.path.pardir] * 6 + ['chrome/browser/resources/protobufs']))
+sys.path.insert(0, proto_generator_path)
+from binary_proto_generator import BinaryProtoGenerator
+
+
+class TLSErrorAssistantProtoGenerator(BinaryProtoGenerator):
+  def ImportProtoModule(self):
+    import tls_error_assistant_pb2
+    globals()['tls_error_assistant_pb2'] = tls_error_assistant_pb2
+
+  def EmptyProtoInstance(self):
+    return tls_error_assistant_pb2.TLSErrorAssistantConfig()
+
+  def ValidatePb(self, opts, pb):
+    assert pb.version_id > 0;

[Nathan Parker, 2016/12/10 00:56:50]

How about verifying that there's at least one entry in the proto?  That'll help
ensure some failure of parsing or a failure to reach the ascii file doesn't end
up with a successful (but wrong) binary proto.

[meacer, 2016/12/13 02:30:16]

Done.

+
+  def ProcessPb(self, opts, pb):
+    binary_pb_str = pb.SerializeToString()
+    outfile = os.path.join(opts.outdir, opts.outbasename)
+    open(outfile, 'wb').write(binary_pb_str)
+
+
+def main():
+  return TLSErrorAssistantProtoGenerator().Run()
+
+if __name__ == '__main__':
+  sys.exit(main())