DO NOT MERGE Add flag to control dynamic shortcuts experment

Also fix the format of pull to refresh experiment flag

Bug 30630964
Bug 30189449

Change-Id: Ib297cee400b5e864a6ca71566c3d4182cb041226
(cherry picked from commit 4846b68b921514384e7701ff96d6d43b9fd2210a)
1 file changed