[Author: dmaclach]
[Author: dmaclach]

Fix up GTMCarbonEvent to fix a major bug with comparing events.
Also increases error checking and makes debugging easier.

R=thomasvl
DELTA=18  (6 added, 0 deleted, 12 changed)

qwertme/google-toolbox-for-mac,jonreid/google-toolbox-for-mac,qwertme/google-toolbox-for-mac,qwertme/google-toolbox-for-mac,jonreid/google-toolbox-for-mac,jonreid/google-toolbox-for-mac