Eliminate hit test for content detection on GestureTap.

Eliminate hit test for content detection on GestureTap.

Currently WebViewImpl does a redundant hit test for content detection even
though we've already done event targeting before it. This patch updates it to
use the hit test result from the targeted event. This also has the positive
side effect that content detection uses the touch adjusted node.

This is part 2 of 2, depends on
https://codereview.chromium.org/603813002/

BUG=381728, 416746
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182997

[Zeeshan Qureshi, 2014-09-24 23:40:20]

zeeshanq@chromium.org changed reviewers:
+ aelias@chromium.org, rbyers@chromium.org

[Zeeshan Qureshi, 2014-09-24 23:40:20]

Rick / Alex PTAL.

[Rick Byers, 2014-09-25 01:11:49]

Looks good, but let's discuss http://crbug.com/417534 before landing this.

[Rick Byers, 2014-09-25 19:29:52]

Ok we agreed we should proceed with this change (highlighting one thing but
activating something else is always just wrong).  The change LGTM.

[aelias_OOO_until_Jul13, 2014-09-29 20:19:25]

lgtm

[Zeeshan Qureshi, 2014-09-30 22:33:04]

The CQ bit was checked by zeeshanq@chromium.org

[commit-bot: I haz the power, 2014-09-30 22:34:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/604573002/20001

[commit-bot: I haz the power, 2014-09-30 22:45:05]

Committed patchset #2 (id:20001) as 182997