[Cast] Add target playout delay CL arg for cast_simulator.

[Cast] Add target playout delay CL arg for cast_simulator.

Also, add results logging of the average lateness of the late video frames.

Committed: https://crrev.com/0092f98ae0ce99da12b3e53f62a3e3297b5dd4c9
Cr-Commit-Position: refs/heads/master@{#295424}

[miu, 2014-09-18 01:22:36]

miu@chromium.org changed reviewers:
+ hclam@chromium.org

[miu, 2014-09-18 01:22:37]

hcalm: PTAL.  I found these simple tweaks useful while I was researching the
frame dropping heuristics.

[Alpha Left Google, 2014-09-18 05:09:16]

The CQ bit was checked by hclam@chromium.org

[Alpha Left Google, 2014-09-18 05:09:16]

lgtm

[commit-bot: I haz the power, 2014-09-18 05:10:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/575313002/1

[commit-bot: I haz the power, 2014-09-18 06:07:53]

Committed patchset #1 (id:1) as d660de15cfbff1808b4f783cd1a440449cc01e11

[commit-bot: I haz the power, 2014-09-18 06:08:41]

Patchset 1 (id:??) landed as
https://crrev.com/0092f98ae0ce99da12b3e53f62a3e3297b5dd4c9
Cr-Commit-Position: refs/heads/master@{#295424}