Fixing Telemetry drag_unittest.py fail on Mac OSX.

Fixing Telemetry drag_unittest.py fail on Mac OSX.

This CL adds handling of the PageActionNotSupported exception for the
test to pass on systems with older browser versions, which does not
support drag gesture yet.

BUG=467090
Committed: https://crrev.com/7c072f8320d9fc3552eae96a5bfd6d6afa0ff0a4
Cr-Commit-Position: refs/heads/master@{#320720}

[ssid, 2015-03-13 19:39:26]

ssid@chromium.org changed reviewers:
+ skyostil@chromium.org

[ssid, 2015-03-13 19:39:26]

PTAL.

[Sami, 2015-03-13 20:15:40]

https://codereview.chromium.org/1007953002/diff/1/tools/telemetry/telemetry/p...
File tools/telemetry/telemetry/page/actions/drag_unittest.py (right):

https://codereview.chromium.org/1007953002/diff/1/tools/telemetry/telemetry/p...
tools/telemetry/telemetry/page/actions/drag_unittest.py:35: return
Please print a message with logging.warning here so this isn't completely
silent.

[ssid, 2015-03-16 10:32:11]

Added the warning.

[ssid, 2015-03-16 10:33:25]

ssid@chromium.org changed reviewers:
+ dcheng@chromium.org

[Sami, 2015-03-16 10:43:00]

Thanks, lgtm.

[ssid, 2015-03-16 10:59:30]

The CQ bit was checked by ssid@chromium.org

[commit-bot: I haz the power, 2015-03-16 10:59:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1007953002/20001

[commit-bot: I haz the power, 2015-03-16 13:05:22]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-16 13:06:05]

Patchset 2 (id:??) landed as
https://crrev.com/7c072f8320d9fc3552eae96a5bfd6d6afa0ff0a4
Cr-Commit-Position: refs/heads/master@{#320720}