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This CL is fixing a bug introduced in previous refactoring. The word
callback is supposed to send to the TTS controller the character
position but it was not updated.

see: https://bugs.chromium.org/p/chromium/issues/detail?id=1146237#c3

The regression was introduced here:
  https://chromium-review.googlesource.com/c/chromium/src/+/2462341

R=dmazzoni@chromium.org,fdoray@chromium.org

Bug: 1146237
Change-Id: Idc30e25ed1565721797362a71b4b19f0432187fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523104Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825369}