add iBitsVaryPercentage parameters to control bitrate
add dec status for freezing
use iBitsVaryPercentage passed by the app instead of the macro
Merge pull request #1574 from huili2/dec_stat_add_freeze

add dec status for freezing
Merge pull request #1568 from ruil2/cleanup

add iBitsVaryPercentage parameters to control bitrate
Merge remote-tracking branch 'upstream/master' into travis.android