GitLab

Extend the AssistantScriptExecutor to store the result of processing
action, successful or not, and report it to the server, which then
decides what new actions to execute.

A notable change is the switch from passing to the actions exactly the
data they need from passing the original action proto, as the
original action proto is necessary anyways to generate a proper result
proto.

This also adds a unit test for the script executor and fix some, but not
all, incompatibilities between the protos defined in assistant.proto and
those on the server.

Change-Id: I190768fb97399daaf347acac762c6ecbb5fe7cad
Bug: 806868
Reviewed-on: https://chromium-review.googlesource.com/1179894
Commit-Queue: Stephane Zermatten <szermatt@google.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585427}