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Previously, setVirtualTimePolicy was always returning a zero virtual
time base when wait_for_navigation was set. This meant, even if virtual
time was enabled before, the client's known virtual time base could be
overridden with an invalid one. Instead, return the previously
initialized virtual time base when it is known, even if
wait_for_navigation is set.

Change-Id: I391232f7310b81c4fc3b033e7ba4c186b32560d3
Reviewed-on: https://chromium-review.googlesource.com/960761
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543052}