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Query source should be set in |AssistantInteractionMetadata| so that we
have the most accurate information possible when setting the pending
query source in |AssistantInteractionController::OnInteractionStarted|.

This is a follow up to:
https://chromium-review.googlesource.com/c/chromium/src/+/1869811

Bug: None
Test: Built locally
Change-Id: I18280710fc48d623c303453ab860c0b0331f071a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1870989
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708262}