ozone: evdev: Fix TouchEvent radius

ozone: evdev: Fix TouchEvent radius

We get the touch ellipse geometry from the major/minor/orientation axis
of the MT protocol. Use those intead of attempting to derive it from
pressure.

BUG=381898
TEST=chrome on pixel with --ash-touch-hud
NOTRY=true

Committed: https://crrev.com/4efef5c727d59a1f7e0468a47f55f6760ad7cfa2
Cr-Commit-Position: refs/heads/master@{#292323}

[spang, 2014-08-26 22:20:43]

spang@chromium.org changed reviewers:
+ alexst@chromium.org, miletus@chromium.org

[Yufeng Shen (Slow to review), 2014-08-26 23:32:30]

miletus@chromium.org changed reviewers:
+ sadrul@chromium.org

[alexst (slow to review), 2014-08-26 23:51:26]

lgtm pending other reviewers.

https://codereview.chromium.org/509713002/diff/1/ui/events/ozone/evdev/touch_...
File ui/events/ozone/evdev/touch_event_converter_evdev.cc (right):

https://codereview.chromium.org/509713002/diff/1/ui/events/ozone/evdev/touch_...
ui/events/ozone/evdev/touch_event_converter_evdev.cc:67: float
TuxelToPizelSize(float val, float num_tuxels, float num_pixels) {
Pizel Size -> Pizza Size? Pixel Size? :)

[spang, 2014-08-27 05:28:28]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2014-08-27 05:29:08]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/spang@chromium.org/509713002/20001

[spang, 2014-08-27 05:30:20]

The CQ bit was unchecked by spang@chromium.org

[spang, 2014-08-28 05:13:28]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2014-08-28 05:14:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/spang@chromium.org/509713002/40001

[commit-bot: I haz the power, 2014-08-28 05:29:13]

Committed patchset #3 (id:40001) as 38afdbc0465716748dd50c7c90592cf1f4b623d4

[commit-bot: I haz the power, 2014-09-10 02:57:37]

Patchset 3 (id:??) landed as
https://crrev.com/4efef5c727d59a1f7e0468a47f55f6760ad7cfa2
Cr-Commit-Position: refs/heads/master@{#292323}