am f0cdfa99: add -since flag to droiddoc options for 7.xml, to apply api filtering to the reference

Merge commit 'f0cdfa9955725c99cd4df6b933e4cb732847ebd1' into eclair-plus-aosp

* commit 'f0cdfa9955725c99cd4df6b933e4cb732847ebd1':
  add -since flag to droiddoc options for 7.xml,