add samples cbrtrace and wrap into samples.dox
add samples cbrtrace and wrap into samples.dox

R=bruening@google.com
BUG=NONE

Review URL: https://codereview.appspot.com/125650043

SVN-Revision: 2786

sigma-random/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,daksunt/dynamorio,daksunt/dynamorio,daksunt/dynamorio,daksunt/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,code4bones/dynamorio,code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio