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This change adds a DataChannelHandler for Action messages and ties it
into ClientSession.  When a new handler is created, it will receive an
ActionExecutor (added in a previous CL) which is used to invoke the
requested action.

BUG: 892434
Change-Id: I56b60fdc56b89900297943eafe78f50982b7681f
Reviewed-on: https://chromium-review.googlesource.com/c/1294715Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608941}