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We are typically extremely conservative when loading the built in tts engine. The only codepath we do this before was in TtsControllerImpl, in response to a speak call.

This change enables loading immediately after the tts settings page registers js message handlers in C++, where a non-null profile is available.

Test: on a fresh profile, navigate to settings -> accessibility ->  tts -> Google tts engine settings. Verify all voices show up.
Change-Id: Id2294f25f034da0a254d904c1325e0d8ba274d21
Reviewed-on: https://chromium-review.googlesource.com/1120948Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572091}