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The input router is recreated after a new input channel is constructed.
Ensure that the Frame Tree Node Id is set in all codepaths.

BUG=827267

Change-Id: Ie8c6a2665afccad23fdea9cfa0dc186c3b919455
Reviewed-on: https://chromium-review.googlesource.com/992357Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547884}