The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0c4b1788e3e0010560d6a064433f4f99afae5fda

commit 0c4b1788e3e0010560d6a064433f4f99afae5fda
Author: rhalavati <rhalavati@chromium.org>
Date: Tue Feb 14 10:00:24 2017

Option added to protobuf build for import directories

Protobuf library GNI does not let BUILD.gn define directories outside the base directory of the source files to be used for importing proto files in source proto files. This is resolved by adding an extra optional parameter that specifies the directories from which proto files are imported.

BUG= 683143 

Review-Url: https://codereview.chromium.org/2646123002
Cr-Commit-Position: refs/heads/master@{#450309}

[modify] https://crrev.com/0c4b1788e3e0010560d6a064433f4f99afae5fda/third_party/protobuf/proto_library.gni
[modify] https://crrev.com/0c4b1788e3e0010560d6a064433f4f99afae5fda/tools/protoc_wrapper/protoc_wrapper.py