Bug 842389 - Return the right thing from ProgressiveUpdate. r=cwiiis, a=lsblakk
Bug 787927 - Prevent self-hosted JS script from being registered with the debugger. r=jimb, a=lsblakk
Bug 850396 - Disable single-tile paint path in BasicTiledThebesLayer. r=bgirard a=lsblakk

This code-path has always had issues, but the fix in bug 842389 causes them
to be exposed more frequently.