Avoid SEGVing in WebGraphicsContext3DCommandBufferImpl::IsCommandBufferContextLost()

BUG=136413


Review URL: https://chromiumcodereview.appspot.com/10766008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@145836 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed