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This CL adds exposureCompensation MediaTrackCapabilities.

Bug: b:151048287
Test: Tested on kukui.
Change-Id: I3e80d4d953d32f2fe123d02df1383206c964a1e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392190
Commit-Queue: Hsu Wei-Cheng <mojahsu@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839094}