Bug 855037 - JäegerMonkey: Check if there is an helper thread for Ion compilation. r=dvander
Bug 857283 - 'Smarter caching of index update queries'. r=khuey.

--HG--
extra : rebase_source : 489638cea833b32d05471188cf3a0b96947404cc
Bug 854583 - Use 'pointer' instead of 'cursor' for mouse lock, r=dolske

--HG--
extra : rebase_source : 8dae0bae57c516727040576a92618cf7a96570b0