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This CL adds whiteBalanceMode(continuous/manual) and colorTemperature
MediaTrackCapabilities.

Bug: b:148527288
Test: Test controls on krane and eve.

Change-Id: I823b7644f5494883161c5bd9567918114c038012
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2235145Reviewed-by: Shik Chen <shik@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Commit-Queue: Hsu Wei-Cheng <mojahsu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807349}