Implement TTS dispatcher using RenderProcessObserver instead of MessageFilter.

Implement TTS dispatcher using RenderProcessObserver instead of MessageFilter.

That guarantees the logic happens on the right thread.

BUG=171887
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=198786

[tommi (sloooow) - chröme, 2013-05-07 09:46:29]

lgtm

[commit-bot: I haz the power, 2013-05-07 09:46:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dmazzoni@chromium.org/15031002/1

[commit-bot: I haz the power, 2013-05-07 09:51:50]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[dmazzoni, 2013-05-07 13:56:51]

+thestig for OWNERS review

[Lei Zhang, 2013-05-07 18:23:11]

lgtm

[commit-bot: I haz the power, 2013-05-07 18:24:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dmazzoni@chromium.org/15031002/1

[commit-bot: I haz the power, 2013-05-07 18:57:04]

Retried try job too often on linux_rel for step(s) browser_tests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-05-07 20:13:42]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dmazzoni@chromium.org/15031002/1

[commit-bot: I haz the power, 2013-05-07 20:13:57]

Change committed as 198786