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Patchset 1 contains the reland without any changes.

This CL adds a callback to the speech recognition client that is called
when all of the mojo pipes are bound, indicating that the speech
recognition service is available.

Bug: 1096632
Change-Id: I0006298c3d3191c84c80d920031abfcbf10e5cf6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260935Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#781504}