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This CL is fixing an inconsistent state that can happen in
the TtsPlatformImplWin class.

TtsPlatformImplWin has a background worker
TtsPlatformImplBackgroundWorkerthat processes
asynchronously tasks and sending back notifications.

There was a corner case where Pause is called
  TtsPlatformImplWin::Pause(...)
and there was a notification in transit to notify the
completion of the current spoke utterance.

This was leading to that state:
  TtsPlatformImplWin::is_speaking_ = false
  TtsPlatformImplWin::paused_ = true

This CL is changing the TtsPlatformImplWin class to handle
properly the notifications sent back by the worker. If the
notifications clear/stop the utterance and the current
state is paused_, a Resume(...) is performed to ensure
a valid state.

R=dmazzoni@chromium.org

Bug: 1167103
Change-Id: I719dca37e08094afc214d469432c7e2541d155f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640753Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846161}