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Also update ArcPolicyBridge, the sole user of these time values.

Context : We have been using SessionManagerImpl::GetArcStartTimeTicks()
for perf measurements, etc, but this doesn't work for ARCVM.
This CL makes ArcSessionManager.arc_start_time() equivalent to
SessionManagerImpl::GetArcStartTimeTicks() by using TimeTicks.

Bug: b/140361966
Test: try
Change-Id: Ic935ccdf8b2177abb0644551a3b422a5e5c0c25c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783687Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693157}