Fixes Start/Stop issue for OpenSL on Android

BUG=328154
TEST=see 328154

Review URL: https://codereview.chromium.org/114983005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240675 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240675