Fix implementation of StopSpeaking, and implement IsSpeaking, for the Windows-native implementation of the TTS API.
Fix implementation of StopSpeaking, and implement IsSpeaking, for the
Windows-native implementation of the TTS API.

BUG=none
TEST=manual testing

Review URL: http://codereview.chromium.org/6249014

git-svn-id: http://src.chromium.org/svn/trunk/src@72439 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d3583995841418e107fbcfe2fbd95c53c0986a62
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser