Add .vpython file for histogram_proto.py.
Add .vpython file for histogram_proto.py.

Starting from [1], //third_party/protobuf has been updated to 3.13.0
and this introduces a breaking change which breaks WebRTC's perf results
upload (see bugs.webrtc.org/12211).

Error:

File [..]/tracing/proto/histogram_proto.py", line 9, in <module>
    import histogram_pb2  # pylint:disable=relative-import
  File "[..]/tracing/proto/histogram_pb2.py", line 22, in <module>
    create_key=_descriptor._internal_create_key,
AttributeError: 'module' object has no attribute '_internal_create_key'

[1] - https://chromium-review.googlesource.com/c/chromium/src/+/2545204

(See bugs.webrtc.org/12211)

Bug: None

Change-Id: I43d624fe29948c72421a5da55f4ffcd8e2dac942
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/2553541
Commit-Queue: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@chromium.org>
Reviewed-by: Dean Berris <34a37f59e4ade3cf49221306f04217acf3e86255@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult