Add a sandbox API for broker handle duplication 

BUG=119250
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=129627
Review URL: https://chromiumcodereview.appspot.com/9838083

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@130029 0039d316-1c4b-4281-b951-d872f2087c98
22 files changed