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This CL changes MediaSettingsRange and PhotoCapabilities interfaces to
dictionaries for logging purposes. This way, web developers will be able
to simply call JSON.stringify(myTrack.getCapabilities()).

Spec: https://github.com/w3c/mediacapture-image/pull/238
Intent to ship: https://groups.google.com/a/chromium.org/g/blink-dev/c/QI8BS5bL5CQ

Bug: 934063
Change-Id: I604d3b119b0e3e8bff48d86b87ea4213325b8a10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317186Reviewed-by: Eero Häkkinen <eero.hakkinen@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#795858}