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Chromium provides PowerObserver and PowerMonitor objects to allow
subsystems to react to power suspend and resume events. On iOS this
actually tracks app lifecycle events for backgrounding.

The patch adds a power observer that destroys the compression session
on power suspend events and re-initializes the compression session on
power resume events. This allows the encoder to properly transition to
the background on iOS and resume when the app comes back to the
foreground.

Note that for this to work overall, the sender client must create a
background task to allow networking to continue. Otherwise the receiver
will timeout per spec.

R=miu@chromium.org
BUG=477895

Review URL: https://codereview.chromium.org/1094403002

Cr-Commit-Position: refs/heads/master@{#326938}