MSE: Update WebM buffered range expectations w.r.t. frame duration processing

MSE: Update WebM buffered range expectations w.r.t. frame duration processing

Chromium-side changes to parse and use optional WebM TrackEntry
DefaultDuration, derive simpleblock frame durations from subsequent
frame duration, or estimate missing frame duration as the maximum
duration seen so far cause changes in mediasource buffered range tests.

This change updates the tests relative to the new WebM frame duration
parsing/derivation/defaulting.

Also includes TestExpectations update to allow these tests to fail until Chromium side lands.

BUG=351166
TBR=acolwell@chromium.org
TEST=All media layout tests pass locally on Linux (with the Chromium prereq CLs applied), and failure is allowed by TestExpectations (without the prereq CLs applied)

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170209

[wolenetz, 2014-03-26 22:18:20]

PTAL.
This is CL #3, and depends on behavior on Chromium side landing first in:
CL #1: https://codereview.chromium.org/213153008/
CL #2: https://codereview.chromium.org/213253006/

[acolwell GONE FROM CHROMIUM, 2014-03-27 18:40:13]

lgtm

[wolenetz, 2014-03-27 18:52:45]

I've changed this to TBR per offline discussion of inclusion of TestExpectations
change in this CL to land this before the Chromium side (so subsequent Chromium
side landing won't break tree).

[wolenetz, 2014-03-27 18:53:19]

The CQ bit was checked by wolenetz@chromium.org

[commit-bot: I haz the power, 2014-03-27 18:53:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/wolenetz@chromium.org/212593007/20001

[commit-bot: I haz the power, 2014-03-27 21:13:36]

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

[commit-bot: I haz the power, 2014-03-27 21:13:36]

Try jobs failed on following builders:
  tryserver.blink on win_blink_rel

[wolenetz, 2014-03-27 21:24:34]

The CQ bit was checked by wolenetz@chromium.org

[commit-bot: I haz the power, 2014-03-27 21:24:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/wolenetz@chromium.org/212593007/20001

[commit-bot: I haz the power, 2014-03-27 22:32:44]

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

[commit-bot: I haz the power, 2014-03-27 22:32:45]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[wolenetz, 2014-03-27 22:33:34]

The CQ bit was checked by wolenetz@chromium.org

[commit-bot: I haz the power, 2014-03-27 22:34:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/wolenetz@chromium.org/212593007/20001

[commit-bot: I haz the power, 2014-03-27 22:36:21]

Change committed as 170209