* Put the temporarily paused queries into a separate map, this should
   be separate functionality from the regular query tracking.

 * Pair down the number of functions that modify the current begin/end
   state.

 * Always pause all old queries and resume all new queries on context
   switch.

BUG=805233

Change-Id: If37a9947b50feaa4e627070ce2a7895aa5034c0e
Reviewed-on: https://chromium-review.googlesource.com/902426
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>