Chrome Endure tests forcefully clear ChromeDriver's node cache on each test iteration.

Chrome Endure tests forcefully clear ChromeDriver's node cache on each test iteration.

This is a temporary workaround to the problem of ChromeDriver continually growing
a DOM node cache while Chrome Endure tests run (significantly impacting the results
reported by Chrome Endure tests).

There is a discussion with the WebDriver team about how to solve this problem in
a better way within WebDriver itself, but for now this workaround should stabilize
the Chrome Endure test results until a better solution is implemented.

BUG=None
TEST=Verified a Gmail Chrome Endure test did not reach steady state in DOM node count
without this change, but did reach steady state with this change.
NOTRY=true


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=147860

[Nirnimesh, 2012-07-22 19:34:18]

LGTM

[commit-bot: I haz the power, 2012-07-23 16:21:02]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dennisjeffrey@chromium.org/10795057/1

[commit-bot: I haz the power, 2012-07-23 16:21:59]

Change committed as 147860