gm: add self-test to confirm that ignore-failure field is respected

gm: add self-test to confirm that ignore-failure field is respected
BUG=skia:1578
R=scroggo@google.com

Committed: https://code.google.com/p/skia/source/detail?r=11047

[epoger, 2013-08-30 19:32:03]

https://codereview.chromium.org/23799004/diff/1/gm/tests/run.sh
File gm/tests/run.sh (right):

https://codereview.chromium.org/23799004/diff/1/gm/tests/run.sh#newcode166
gm/tests/run.sh:166: # TODO: for now, this just copies in the
different-pixels.json input file
Patchset 1 adds a new "different-pixels-ignore-some-failures" self-test, but for
now it is based on input that is identical to the
"compared-against-different-pixels" self-test (in which none of the expectations
are marked as ignore-failure).

[epoger, 2013-08-30 19:53:01]

Ready for review.

https://codereview.chromium.org/23799004/diff/5001/gm/tests/outputs/ignoring-...
File gm/tests/outputs/ignoring-some-failures/output-expected/json-summary.txt
(right):

https://codereview.chromium.org/23799004/diff/5001/gm/tests/outputs/ignoring-...
gm/tests/outputs/ignoring-some-failures/output-expected/json-summary.txt:7:
"565/selftest1.png" : [ "bitmap-64bitMD5", 12927999507540085554 ]
As expected... we are now ignoring failure for the test that was marked as
"ignore-failure":true ... but not the other one.

https://codereview.chromium.org/23799004/diff/5001/gm/tests/run.sh
File gm/tests/run.sh (right):

https://codereview.chromium.org/23799004/diff/5001/gm/tests/run.sh#newcode171
gm/tests/run.sh:171: sed -e "0,/$OLD/{s/$OLD/$NEW/}"
$JSON_DIR/different-pixels.json \
Patchset 2 modified the input file such that exactly ONE of the tests is marked
as "ignore-failure":true.

[scroggo, 2013-08-30 20:01:24]

lgtm

[epoger, 2013-08-30 20:19:43]

Committed patchset #2 manually as r11047 (presubmit successful).