> With respect to the patch, I believe it was applied successfully -- I selected the option "y".
 >
 >       SHELL-PROMPT: emacs HOME$ patch -p1 < frame.c.diff
 >
 >       patching file src/frame.c
 >
 >       Reversed (or previously applied) patch detected!  Assume -R? [n] y

Strange.  Are you sure you had a pristine frame.c?  What does git diff
give for your Emacs tree?

 >       Hunk #3 succeeded at 4840 (offset 9 lines).

If you have no private changes in frame.c do a C-x v u in a buffer
showing frame.c and afterwards do

git apply frame.c.diff

followed by make.

 > I believe that `x-create-frame' is expecting an integer:
 >
 >       Debugger entered--Lisp error: (wrong-type-argument integerp 400.0)

That would indicate that my patch was not applied or you did not build
Emacs correctly afterwards.  In any case I attach the patch again.

martin