Updating Maps pixel test for stability

Added a RAF wait, support for devicePixelRatios other than 1, screenshot archiving, and test expectations support

BUG=143317
R=kbr@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=236021

[bajones, 2013-11-19 01:00:14]

Please take a look. This seems to have resolved at least some of the issues
experienced previously, and has added facilities to better debug future
failures.

[Ken Russell (switch to Gerrit), 2013-11-19 01:22:30]

lgtm

https://codereview.chromium.org/75133005/diff/40001/content/test/gpu/gpu_test...
File content/test/gpu/gpu_tests/maps.py (right):

https://codereview.chromium.org/75133005/diff/40001/content/test/gpu/gpu_test...
content/test/gpu/gpu_tests/maps.py:35: MapsValidator.SpinWaitOnRAF(tab, 3)
Please add a TODO about removing this, since theoretically it shouldn't be
needed.

https://codereview.chromium.org/75133005/diff/40001/content/test/gpu/gpu_test...
content/test/gpu/gpu_tests/maps.py:141: default="unknownrev")
Presumably this command line argument will be added to the GPU recipe afterward?

[bajones, 2013-11-19 18:27:30]

https://codereview.chromium.org/75133005/diff/40001/content/test/gpu/gpu_test...
File content/test/gpu/gpu_tests/maps.py (right):

https://codereview.chromium.org/75133005/diff/40001/content/test/gpu/gpu_test...
content/test/gpu/gpu_tests/maps.py:35: MapsValidator.SpinWaitOnRAF(tab, 3)
On 2013/11/19 01:22:30, Ken Russell wrote:
> Please add a TODO about removing this, since theoretically it shouldn't be
> needed.

Done.

https://codereview.chromium.org/75133005/diff/40001/content/test/gpu/gpu_test...
content/test/gpu/gpu_tests/maps.py:141: default="unknownrev")
On 2013/11/19 01:22:30, Ken Russell wrote:
> Presumably this command line argument will be added to the GPU recipe
afterward?

The maps test has been removed from the recipe at the moment, but yes, these
arguments will be passed in when the test is added. It will essentially be a
copy/paste of the code being used for pixel_test.

[bajones, 2013-11-19 18:29:49]

Committed patchset #3 manually as r236021 (presubmit successful).