Call BufferStorage::markUsage when we retrieve a buffer pointer for rendering, instead of when we prepare data. The automatic call eliminates function calls from other points in the library. TRAC #22852 Signed-off-by: Geoff Lang Signed-off-by: Nicolas Capens Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2288 736b8ea6-26fd-11df-bfd4-992fa37f6226