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This CL adds a histogram metric to capture the percentage of Live caption users using the Speech On-Device API(SODA).

Bug: 1159105
Change-Id: Ia67c60b59c5f5f9e670c8a8e531c11cbf40f7e52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594171Reviewed-by: Chris Thompson <cthomp@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#839031}