commit d05100dbe9ee569a066b55833438cb785a389245
author rtoy@chromium.org <rtoy@chromium.org> Fri May 22 22:16:44 2015
committer rtoy@chromium.org <rtoy@chromium.org> Fri May 22 22:16:44 2015
tree 3c1806d4baf5d48ff83b83b10f781a2413a01f7c
parent 981e2511e977683df1f7366b89ad6d672d919345

Access current frame counter carefully and remove m_cachedSampleFrame.

m_cachedSampleFrame was added in https://codereview.chromium.org/773273002 to 
handle a race condition on accessing the the current frame counter that is being
updated in the audio thread.  Use acquireLoad and releaseStore so no race can
happen while it is being updated.

BUG=488211
TEST=Ran the TSAN test case from issue 431874 without problems.

Review URL: https://codereview.chromium.org/1149913002

git-svn-id: svn://svn.chromium.org/blink/trunk@195816 bbb929c8-8fbe-4397-9dbb-9b2b20218538