Increase tolerance for touch-snapping near the screen edges

Increases tolerance for touch-snapping near the screen edges

BUG=316645
TEST=ash_unittests --gtest_filter=*SystemGestureEventFilterTest.Drag*NearEdgeSnaps*

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=233978

[varkha, 2013-11-08 17:43:53]

+jamescook, Could you please take a look? This increases snapping or docking
target for touch and makes it possible to snap / dock windows using a touch
screen. When the dock is already open there is no need since the finger can
cross the boundary between the work area and the dock while still being on
screen. Thanks!

https://codereview.chromium.org/58973004/diff/1/ash/wm/system_gesture_event_f...
File ash/wm/system_gesture_event_filter_unittest.cc (right):

https://codereview.chromium.org/58973004/diff/1/ash/wm/system_gesture_event_f...
ash/wm/system_gesture_event_filter_unittest.cc:499: gfx::Rect bounds(250, 150,
100, 100);
This prevents docking or snapping by making sure that the finger does not get
too close to the screen edge.

[James Cook, 2013-11-08 18:14:23]

lgtm

[commit-bot: I haz the power, 2013-11-08 18:56:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/varkha@chromium.org/58973004/90001

[commit-bot: I haz the power, 2013-11-08 19:41:53]

Retried try job too often on linux_rel for step(s) check_deps
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-11-08 19:44:39]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/varkha@chromium.org/58973004/90001

[commit-bot: I haz the power, 2013-11-08 20:43:24]

Change committed as 233978