Make click targets inside links work.

Make click targets inside links work.

There are pages that attach click handlers to elements that are found inside links, and screen readers might try to click such elements. Our existing doDefaultAction logic wasn't handling this possibility.
For example, there might be a graphic inside a link and the screen reader might invoke the default action on the graphic.
BUG=615904
TBR=dmazzoni@chromium.org

Committed: https://crrev.com/f491eb9a53ed36e90ab45c943a0e52247ec00da5
Cr-Commit-Position: refs/heads/master@{#397760}

[nektarios, 2016-06-03 16:16:28]

The CQ bit was checked by nektar@chromium.org

[commit-bot: I haz the power, 2016-06-03 16:16:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2030413002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2030413002/1

[dmazzoni, 2016-06-03 16:36:00]

lgtm

[commit-bot: I haz the power, 2016-06-03 18:22:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-03 18:24:17]

Description was changed from

==========
Make click targets inside links work.

There are pages that attach click handlers to elements that are found inside
links, and screen readers might try to click such elements. Our existing
doDefaultAction logic wasn't handling this possibility.
For example, there might be a graphic inside a link and the screen reader might
invoke the default action on the graphic.
BUG=615904
TBR=dmazzoni@chromium.org
==========

to

==========
Make click targets inside links work.

There are pages that attach click handlers to elements that are found inside
links, and screen readers might try to click such elements. Our existing
doDefaultAction logic wasn't handling this possibility.
For example, there might be a graphic inside a link and the screen reader might
invoke the default action on the graphic.
BUG=615904
TBR=dmazzoni@chromium.org

Committed: https://crrev.com/f491eb9a53ed36e90ab45c943a0e52247ec00da5
Cr-Commit-Position: refs/heads/master@{#397760}
==========

[commit-bot: I haz the power, 2016-06-03 18:24:18]

Patchset 1 (id:??) landed as
https://crrev.com/f491eb9a53ed36e90ab45c943a0e52247ec00da5
Cr-Commit-Position: refs/heads/master@{#397760}

[jbroman, 2016-06-03 19:54:46]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2036943003/ by jbroman@chromium.org.

The reason for reverting is: Failing on Mac 10.11 (dbg):
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.11%20%28...

Error message is:

Harness Error. harness_status.status = 2 , harness_status.message = null

Sorry to revert this again. :(.