am be07e6a4: am c80188eb: am 9b516383: am e35d9280: cherrypick from jb-dev Change-Id: Idecee238d8872ca1c32a80d13ad61bacf89c39f7 docs: Systrace tool documentation
* commit 'be07e6a4':
cherrypick from jb-dev Change-Id: Idecee238d8872ca1c32a80d13ad61bacf89c39f7 docs: Systrace tool documentation