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Adds an option to the VR bisect script to run in manual mode. This
removes the automatic "gclient sync" and waits for user input before
building and running the test. This is meant to be used in the rare case
that some change in the bisect range breaks gclient sync and requires
some DEPS change to fix. This allows the user to manually add in the fix
and sync while still allowing the script to handle the building,
running, and result retrieval.

Change-Id: I7bfd5b7b059dec84b3feefbbc6ada3e01659d30d
Reviewed-on: https://chromium-review.googlesource.com/1014460Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551374}