Mojo: Get rid of ui::gfx from sample_app

Mojo: Get rid of ui::gfx from sample_app

This CL replaces gfx based geometry objects with ones from mojo::.

TEST=none
R=beng@chromium.org, viettrungluu@chromium.org
BUG=330467
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284951

[darin (slow to review), 2014-07-22 23:39:30]

LGTM

[Hajime Morrita, 2014-07-22 23:59:39]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-07-23 00:01:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/morrita@chromium.org/409263002/1

[commit-bot: I haz the power, 2014-07-23 01:54:42]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-07-23 03:43:09]

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

[commit-bot: I haz the power, 2014-07-23 03:43:10]

Try jobs failed on following builders:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[Hajime Morrita, 2014-07-23 16:39:36]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-07-23 16:41:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/morrita@chromium.org/409263002/1

[commit-bot: I haz the power, 2014-07-23 16:43:34]

Change committed as 284951