Telemetry: document.documentElement.scrollTop/Left is zero

Telemetry: document.documentElement.scrollTop/Left is zero

In order for bug 157855 to get fixed without breaking a related telemetry unit test (page/actions/scroll_unittest.py), this patch changes the way  scrollTop property is checked: it uses an annotation similar to the how real world  WebPages do, where both documentElement and body is checked for cross browser compatibility.

Once bug 157855, it should be encouraged to adopt scrollTop of documentElement only.

BUG=302707
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=226872

[tonyg, 2013-10-03 03:11:38]

lgtm

[commit-bot: I haz the power, 2013-10-03 13:11:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/a1.gomes@sisa.samsung.com/25541005/2001

[commit-bot: I haz the power, 2013-10-03 13:32:04]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[commit-bot: I haz the power, 2013-10-03 13:46:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/a1.gomes@sisa.samsung.com/25541005/11001

[commit-bot: I haz the power, 2013-10-03 14:05:07]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[commit-bot: I haz the power, 2013-10-03 20:07:46]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/a1.gomes@sisa.samsung.com/25541005/11001

[commit-bot: I haz the power, 2013-10-03 22:25:36]

Change committed as 226872