Indicate user gesture for mouse down/up while pointer locked.

Indicate user gesture for mouse down/up while pointer locked.

Previously all mouse down/up events failed to signal a user gesture,
causing errors when attempting to use an API such as Fullscreen that
require a user gesture.

BUG=403077
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181373

[scheib, 2014-09-03 19:24:19]

scheib@chromium.org changed reviewers:
+ jochen@chromium.org

[scheib, 2014-09-03 19:24:20]

jochen, PTAL, as you recently did user gesture work in this area.

[jochen (gone - plz use gerrit), 2014-09-04 09:47:07]

lgtm

[scheib, 2014-09-04 15:52:34]

The CQ bit was checked by scheib@chromium.org

[commit-bot: I haz the power, 2014-09-04 15:53:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/scheib@chromium.org/535313002/1

[commit-bot: I haz the power, 2014-09-04 15:58:47]

Committed patchset #1 (id:1) as 181373