Raw error output:
Problem while applying patch in revision 29469:
hg error in cmd: hg import --no-commit -s 95 /tmp/tmpnpvcbjmj: applying /tmp/tmpnpvcbjmj
patching file dom/canvas/TexUnpackBlob.cpp
Hunk #3 FAILED at 581
1 out of 3 hunks FAILED -- saving rejects to file dom/canvas/TexUnpackBlob.cpp.rej
abort: patch failed to apply