Suppress two WebGL conformance failures on Mac 10.9 with Intel HD 3000 GPU.

Suppress two WebGL conformance failures on Mac 10.9 with Intel HD 3000 GPU.

Required exposing new Mac versions to Telemetry's test expectations.
Added unit test.

BUG=417415
Committed: https://crrev.com/e9b529eed5b782cc44ecfe85d23346bcce12d9fa
Cr-Commit-Position: refs/heads/master@{#296634}

[Ken Russell (switch to Gerrit), 2014-09-24 20:34:59]

kbr@chromium.org changed reviewers:
+ bajones@chromium.org, dtu@chromium.org, tonyg@chromium.org

[Ken Russell (switch to Gerrit), 2014-09-24 20:34:59]

Please review. Thanks.

[bajones, 2014-09-24 20:50:30]

lgtm

[tonyg, 2014-09-24 21:29:34]

lgtm

https://codereview.chromium.org/597383002/diff/1/tools/telemetry/telemetry/pa...
File tools/telemetry/telemetry/page/test_expectations.py (right):

https://codereview.chromium.org/597383002/diff/1/tools/telemetry/telemetry/pa...
tools/telemetry/telemetry/page/test_expectations.py:9: 'mavericks', 'yosemite',
'linux', 'chromeos', 'android']
Fix lgtm for now, but this static list seems hard to maintain. For instance,
it's missing win8. Each platform knows the strings that it supports. It seems
preferable to just query those all here.

[Ken Russell (switch to Gerrit), 2014-09-24 21:39:01]

https://codereview.chromium.org/597383002/diff/1/tools/telemetry/telemetry/pa...
File tools/telemetry/telemetry/page/test_expectations.py (right):

https://codereview.chromium.org/597383002/diff/1/tools/telemetry/telemetry/pa...
tools/telemetry/telemetry/page/test_expectations.py:9: 'mavericks', 'yosemite',
'linux', 'chromeos', 'android']
On 2014/09/24 21:29:34, tonyg wrote:
> Fix lgtm for now, but this static list seems hard to maintain. For instance,
> it's missing win8. Each platform knows the strings that it supports. It seems
> preferable to just query those all here.

Good point. Agree that this list should be generated more automatically. It
wasn't immediately obvious how to do this so I've filed Issue 417449 to track
it.

[Ken Russell (switch to Gerrit), 2014-09-24 21:39:04]

The CQ bit was checked by kbr@chromium.org

[commit-bot: I haz the power, 2014-09-24 21:39:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/597383002/1

[commit-bot: I haz the power, 2014-09-25 03:21:49]

Committed patchset #1 (id:1) as e13f4b0fc9711faf8e247b0248328da806643e3d

[commit-bot: I haz the power, 2014-09-25 03:22:39]

Patchset 1 (id:??) landed as
https://crrev.com/e9b529eed5b782cc44ecfe85d23346bcce12d9fa
Cr-Commit-Position: refs/heads/master@{#296634}