rebaseline_server: display as much info as possible if expected/actual image is missing

rebaseline_server: display as much info as possible if expected/actual image is missing

BUG=skia:2368
NOTRY=True

Committed: http://code.google.com/p/skia/source/detail?r=14019

[epoger, 2014-04-01 20:39:35]

Ready for review at patchset 2.

And you can see it in action at http://172.24.179.183:8888/

I used it to rebaseline one of the images whose expected image did not load, and
it worked fine.

[borenet, 2014-04-01 21:15:56]

LGTM

https://codereview.chromium.org/221423003/diff/20001/gm/rebaseline_server/tes...
File
gm/rebaseline_server/testdata/outputs/expected/compare_configs_test.CompareConfigsTest.test_gm/gm.json
(right):

https://codereview.chromium.org/221423003/diff/20001/gm/rebaseline_server/tes...
gm/rebaseline_server/testdata/outputs/expected/compare_configs_test.CompareConfigsTest.test_gm/gm.json:1:
{
I have no idea what these files mean, but I think I understand how they
changed...

[epoger, 2014-04-01 21:23:15]

The CQ bit was checked by epoger@google.com

[commit-bot: I haz the power, 2014-04-01 21:34:22]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/epoger@google.com/221423003/20001

[commit-bot: I haz the power, 2014-04-01 21:54:37]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/epoger@google.com/221423003/20001

[commit-bot: I haz the power, 2014-04-01 22:16:56]

Change committed as 14019