[3/6] user32: Add message tests for TrackPopupMenu.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://newtestbot.winehq.org/JobDetails.pl?Key=5454

Your paranoid android.


=== w8 (32 bit msg) ===
msg.c:5991: Test failed: Update region shouldn't be empty
msg.c:6225: Test failed: InvalidateErase: 0: the msg sequence is not complete: expected 0085 - actual 0000
msg.c:6227: Test failed: Paint: 0: the msg sequence is not complete: expected 000f - actual 0000
msg.c:5997: Test failed: Regions are different
msg.c:5997: Test failed: Regions are different
msg.c:5997: Test failed: Regions are different
msg.c:8398: Test failed: did not get expected count for minimum timeout (54 != ~64).
msg.c:12121: Test failed: unexpected message 31f
msg.c:12122: Test failed: bad wparam 1
msg.c:12132: Test failed: unicode WM_CHAR: 0: the msg sequence is not complete: expected 0102 - actual 0000