Fix type truncation warnings in YUV-related code.

Fix type truncation warnings in YUV-related code.

BUG=81439
TEST=none

Committed: https://crrev.com/b9944315f9b1888d59d04072e1d72ddfce600185
Cr-Commit-Position: refs/heads/master@{#299409}

[Peter Kasting, 2014-10-13 23:33:00]

pkasting@chromium.org changed reviewers:
+ dalecurtis@chromium.org

[DaleCurtis, 2014-10-13 23:36:18]

lgtm, presumably you're not using the _t versions for consistency with
surrounding code?

[Peter Kasting, 2014-10-13 23:42:36]

On 2014/10/13 23:36:18, DaleCurtis wrote:
> lgtm, presumably you're not using the _t versions for consistency with
> surrounding code?

Precisely.

[Peter Kasting, 2014-10-13 23:43:22]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2014-10-13 23:44:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/656663002/20001

[commit-bot: I haz the power, 2014-10-14 00:24:19]

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

[commit-bot: I haz the power, 2014-10-14 00:24:20]

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

[Peter Kasting, 2014-10-14 00:27:50]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2014-10-14 00:29:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/656663002/20001

[commit-bot: I haz the power, 2014-10-14 00:53:37]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-10-14 00:54:30]

Patchset 2 (id:??) landed as
https://crrev.com/b9944315f9b1888d59d04072e1d72ddfce600185
Cr-Commit-Position: refs/heads/master@{#299409}