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This change introduces support for the action navigate, which tells the
browser to go to a specific URL. The action finishes without waiting for
the new page to load.

Bug: 806868
Change-Id: Ibe354eb627b836e6e1d5ad5ff461a8b392102faa
Reviewed-on: https://chromium-review.googlesource.com/1248783
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595061}