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Previously we used the OnConversationTurnStarted API to notify us of
when an interaction was starting in LibAssistant. This API did not give
us any metadata about the interaction, so we couldn't match it with
confidence to one of our requests.

The new API exposes an ID through the |metadata| param. We can use that
ID to match an interaction request with a conversation turn. Once fully
wired up, this will allow us to stop pending a query before a conversation
turn starts and instead only do so within our interaction lifecycle. Once
lifecycle has been fixed, a number of downstream bugs will be resolved.

The CL to fix lifecycle will be a follow up. This CL only exposes the
interaction metadata that we will need in order to do so.

Bug: 941259, 973680
Change-Id: I32edf71251272aa21dc571df40f15b8de12cefba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757425
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689578}