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This CL adds focusMode(continuous/manual) and focusDistance
MediaTrackCapabilities.

Bug: b:151048287, 1068176
Test: Tested logitech camera on eve. Test WFC of kukui.
Change-Id: I85fa31b8b4f147b8cc054eac3f94974595545c05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371843
Commit-Queue: Hsu Wei-Cheng <mojahsu@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836565}