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This CL brings in a chromecast version of the extension
api permissions that will have to be registered for
ChromeVox.  Most of the APIs will end up being stubbed.

Bug: 73383411
Test: None
Change-Id: I6d847a9d3d6d19a016274c1498eb9a5f45c793fc
Reviewed-on: https://chromium-review.googlesource.com/1049956
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557291}