Fix unhandled promise console message to show stack trace of a DOMException.

Fix unhandled promise console message to show stack trace of a DOMException.

BUG=393913
R=pfeldman@chromium.org, yurys@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183985

[aandrey, 2014-10-15 14:47:05]

This depends on https://codereview.chromium.org/655243002/

[aandrey, 2014-10-15 14:55:58]

On 2014/10/15 14:47:05, aandrey wrote:
> This depends on https://codereview.chromium.org/655243002/

... and on https://codereview.chromium.org/657063002/

[yurys, 2014-10-17 09:38:45]

lgtm

[aandrey, 2014-10-17 09:53:49]

The CQ bit was checked by aandrey@chromium.org

[commit-bot: I haz the power, 2014-10-17 09:54:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/660543002/1

[commit-bot: I haz the power, 2014-10-17 10:05:17]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-17 10:05:18]

Try jobs failed on following builders:
  linux_chromium_gn_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_chromium_gn_rel/bu...)
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/27463)

[aandrey, 2014-10-20 13:07:12]

The CQ bit was checked by aandrey@chromium.org

[commit-bot: I haz the power, 2014-10-20 13:08:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/660543002/1

[commit-bot: I haz the power, 2014-10-20 14:29:39]

Committed patchset #1 (id:1) as 183985