Document purpose of low_delay flag in VideoDecoder interface.

Document purpose of low_delay flag in VideoDecoder interface.

low_delay flag in VideoDecoder::Initialize() wasn't documented properly.
Adding comments explaining the purpose of this flag.

R=xhwang@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/e8b6f98362f7d85a7c8f26e6cc51dec388a377b7

[Sergey Ulanov, 2015-01-21 23:45:35]

sergeyu@chromium.org changed reviewers:
+ xhwang@chromium.org

[Sergey Ulanov, 2015-01-21 23:45:36]

This is a portion of https://codereview.chromium.org/805193006/ that is not
related to the bug I'm trying to fix there.

[xhwang, 2015-01-22 00:58:06]

lgtm

Thanks!

[Sergey Ulanov, 2015-01-22 17:33:51]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2015-01-22 17:35:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/868443004/1

[commit-bot: I haz the power, 2015-01-22 18:48:36]

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

[commit-bot: I haz the power, 2015-01-22 18:48:37]

Try jobs failed on following builders:
  linux_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu/builds/...)
  linux_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_trigger...)

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

[Sergey Ulanov, 2015-01-22 18:53:11]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2015-01-22 18:54:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/868443004/1

[commit-bot: I haz the power, 2015-01-22 18:55:18]

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

[commit-bot: I haz the power, 2015-01-22 18:55:19]

Try jobs failed on following builders:
  linux_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu/builds/...)
  linux_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_trigger...)

[commit-bot: I haz the power, 2015-01-22 19:53:55]

Patchset 1 (id:??) landed as
https://crrev.com/e8b6f98362f7d85a7c8f26e6cc51dec388a377b7
Cr-Commit-Position: refs/heads/master@{#312657}

[Sergey Ulanov, 2015-01-22 19:54:06]

Committed patchset #1 (id:1) manually as
e8b6f98362f7d85a7c8f26e6cc51dec388a377b7 (presubmit successful).