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A frozen RenderWidget must still be made visible when the RenderView
is made visible (background tab becoming foreground) because RenderView
reads the RenderWidget to determine the Page visibility (even though we
have IPCs to the RenderView telling it what to use~~!).

This is bad but we can't leave us crashing in Canary so avoid chaning
compositor visibility even though the RenderWidget is changing, and the
compositor's will catch up when unfreezing.

R=ajwong@chromium.org, piman@chromium.org

Change-Id: Idbc81efacd331c227d01ad61e182ccdf98bf2c42
Bug: 896836
Reviewed-on: https://chromium-review.googlesource.com/c/1340864
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609389}