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

chrome/browser/resources/ssl/tls_error_assistant/BUILD.gn

Index: chrome/browser/resources/ssl/tls_error_assistant/BUILD.gn
diff --git a/chrome/browser/resources/ssl/tls_error_assistant/BUILD.gn b/chrome/browser/resources/ssl/tls_error_assistant/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..2579fb2de641d1b36cedbf368879f75676760d60
--- /dev/null
+++ b/chrome/browser/resources/ssl/tls_error_assistant/BUILD.gn
@@ -0,0 +1,44 @@
+# 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.
+
+# Generate the binary proto form of "tls_error_assistant" from the ascii proto.
+action("make_tls_error_assistant_protobuf") {
+  script = "gen_tls_error_assistant_proto.py"
+
+  # The output goes in $target_gen_dir since that's where
+  # chrome/browser/browser_resources.grd will look for it.
+
+  input_filename = "tls_error_assistant.asciipb"
+  output_dir = target_gen_dir
+  output_basename = "tls_error_assistant.pb"
+  python_path_root = "$root_out_dir/pyproto"
+  python_path_ssl = "$python_path_root/chrome/browser/ssl/"
+
+  inputs = [
+    input_filename,
+  ]
+
+  deps = [
+    "//chrome/browser/ssl:proto",
+    "//third_party/protobuf:py_proto",
+  ]
+
+  outputs = [
+    "$output_dir/$output_basename",
+  ]
+
+  args = [
+    "-w",
+    "-i",
+    rebase_path(input_filename, root_build_dir),
+    "-d",
+    rebase_path(output_dir, root_build_dir),
+    "-o",
+    output_basename,
+    "-p",
+    rebase_path(python_path_root, root_build_dir),
+    "-p",
+    rebase_path(python_path_ssl, root_build_dir),
+  ]
+}