Switch 16 sample gpu configs to 8 samples
BUG=skia:

Change-Id: I053cce7c05c74860cbace00cd94ea4b96e9a482c
Reviewed-on: https://skia-review.googlesource.com/9889
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
37 files changed