Target touches to the correct display.

Target touches to the correct display.

ui::TouchEvents now know the id of their source device.
The target of a touch can't be effected by a touch on another display.

Relanding https://codereview.chromium.org/103173004/, after it was
reverted https://codereview.chromium.org/103173004. When ensuring that
the GR wasn't reused between tests, I had neglected to delete the old
GR.

BUG=315651
TEST=GestureRecognizerTest.GestureEventTouchLockIgnoresOtherScreens

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=244220

[tdresser, 2014-01-10 14:08:45]

Sadrul, can you take a look?

Only change from https://codereview.chromium.org/103173004 is:

 void GestureRecognizer::Reset() {
+  delete g_gesture_recognizer_instance;
   g_gesture_recognizer_instance = NULL;
 }

I'm open to switching to a scoped_ptr, if you think that makes more sense.

[sadrul, 2014-01-10 16:59:24]

We don't use scoped_ptr<> for other similar singleton objects (e.g. aura::Env,
ash::Shell). So this looks reasonable. LGTM

[commit-bot: I haz the power, 2014-01-10 17:05:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tdresser@chromium.org/132123004/1

[commit-bot: I haz the power, 2014-01-10 19:52:59]

Change committed as 244220