Fix run_decoding_tests on xoom.

Fix run_decoding_tests on xoom.

Builder Test-Android-Xoom-Tegra2-Arm7-Debug fails run_decoding_tests
due to a couple of images. Add a way in skimage to ignore failures
if an image is expected to fail. Add an expectations file for xoom
that includes ignore-failure for the two files which are failing.

I have created https://code.google.com/p/skia/issues/detail?id=1382
to track the fact that these images fail to decode, despite the bot
showing green.

R=borenet@google.com

Committed: https://code.google.com/p/skia/source/detail?r=9797

[scroggo, 2013-06-27 20:09:48]

https://codereview.chromium.org/18023008/diff/1/expectations/skimage/base-and...
File expectations/skimage/base-android-xoom.json (left):

https://codereview.chromium.org/18023008/diff/1/expectations/skimage/base-and...
expectations/skimage/base-android-xoom.json:1: {
The previous file here is base-shuttle_ubuntu12_ati5770.json

https://codereview.chromium.org/18023008/diff/1/expectations/skimage/base-and...
File expectations/skimage/base-android-xoom.json (right):

https://codereview.chromium.org/18023008/diff/1/expectations/skimage/base-and...
expectations/skimage/base-android-xoom.json:59: [ "bitmap-64bitMD5",
15513164475782874663 ]
The new file actually comes from the nexus-7 buildbot. The fact that this number
is different reflects the fact that the nexus-7 decodes desk_yahoonews_0.jpg
incorrectly (see https://code.google.com/p/skia/issues/detail?id=1282). Note
that it would be okay to be different due to rounding differences between the
two devices etc, but that is not the case here.

https://codereview.chromium.org/18023008/diff/1/expectations/skimage/base-and...
expectations/skimage/base-android-xoom.json:61: "ignore-failure" : true
This is the meat of the change - if skimage fails to decode this file, it will
not report a failed buildstep, since we already know it is broken.

https://codereview.chromium.org/18023008/diff/1/expectations/skimage/base-and...
expectations/skimage/base-android-xoom.json:69: "kokteylogo.png_[26,0,57,17]" :
{
These are included in the Android versions but not the other because they
represent subset decoding, which is currently only supported on Android.

[borenet, 2013-06-27 20:15:15]

LGTM

[scroggo, 2013-06-27 20:21:09]

Committed patchset #1 manually as r9797 (presubmit successful).

[epoger, 2013-07-08 15:48:01]

lgtm