Pushed by bballo@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/af49d91a7ab8 Recompute mIsScrollableLayerInRootContainer correctly if containerless scrolling is disabled during the scroll frame's lifetime. r=mstange https://hg.mozilla.org/integration/autoland/rev/4d0c4aba40e2 Disable container scrolling for test_group_minimum_scale_size.html. r=kats https://hg.mozilla.org/integration/autoland/rev/5f34e60a5359 Enable RDL in APZ mochitests that had it disabled due to container scrolling. r=kats https://hg.mozilla.org/integration/autoland/rev/9bc5d0903129 Increase the content size in position-fixed-out-of-view.html to avoid bug 1527187. r=hiro