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This parameter is needed to distinguish between user initiated requests
and requests that we make ourselves.

User generated requests initiate a conversation interaction that will
return contextual cards. This may result from a suggestion chip press
or Assistant stylus tool selection.

Requests that do not originate from the user will not return contextual
cards or start a conversation interaction. Instead, we will cache the
screen context to send alongside subsequent voice/text queries for
context. This portion is not yet wired up.

Bug: b:112113187
Change-Id: I12cd531745d174738988808d7637c8529ddd80d0
Reviewed-on: https://chromium-review.googlesource.com/1170428
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582459}