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Move Linux TTS platform code to a worker thread

This CL is moving the libspeech synthesizer code to a worker thread.

This CL is splitting the logic in two parts. The first part is the
control logic which stay on the UI Thread. The second part is the
synthesizer logic which is running on a worker thread.

Bug: 869399, 1133813
Change-Id: I212f58ff94e5deac7950e206e4aac484d285f0f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488045
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820302}