ui/gfx: optimize RGBA to RGB conversion by using memcpy in png_codec.cc

ui/gfx: optimize RGBA to RGB conversion by using memcpy in png_codec.cc

BUG=none
TEST=gfx_unittests --gtest_filter="PNGCodec*"

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=283385

[hyunki, 2014-07-15 14:44:35]

Please take a look. Thanks. :)

[hyunki, 2014-07-15 14:55:02]

Sorry. I've updated the reviewers.

[Lei Zhang, 2014-07-15 17:22:48]

lgtm, but you need a ui/ OWNER to review.

[hyunki, 2014-07-15 18:26:05]

Ping. PTAL. Thank you.

[sky, 2014-07-15 20:37:44]

LGTM

[sky, 2014-07-15 20:39:12]

LGTM

[hyunki, 2014-07-15 21:13:00]

Thanks for the review.

[hyunki, 2014-07-15 21:13:04]

The CQ bit was checked by hyunki.baik@samsung.com

[commit-bot: I haz the power, 2014-07-15 21:16:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hyunki.baik@samsung.com/397673002/1

[commit-bot: I haz the power, 2014-07-16 05:22:38]

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

[commit-bot: I haz the power, 2014-07-16 05:43:25]

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

[commit-bot: I haz the power, 2014-07-16 05:43:26]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[hyunki, 2014-07-16 05:53:23]

The CQ bit was checked by hyunki.baik@samsung.com

[commit-bot: I haz the power, 2014-07-16 05:58:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hyunki.baik@samsung.com/397673002/1

[commit-bot: I haz the power, 2014-07-16 06:23:01]

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

[commit-bot: I haz the power, 2014-07-16 07:33:36]

Change committed as 283385