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This change forwards parameters taken from the Intent to SupportsSite
and the initial GetAction requests. Ownership of parameters moves up to
the controller, so it's available at the points where the requests for
these RPCs are built.

Bug: 806868
Change-Id: Id93c5d7d43997ba61fff10558bc010f9d859bbfd
Reviewed-on: https://chromium-review.googlesource.com/1233534
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593502}