MSE: Reduce spurious buffered range discontinuities

MSE: Reduce spurious buffered range discontinuities

Includes last frame's duration in the determination of
SourceBufferStream's |max_interbuffer_distance_|, to prevent an
unusually long segment-ending frame from triggering discontinuity when
adjacent buffers are appended.  A more correct fix requires
StreamParsers to always emit valid frame durations (crbug 351166), and
would use them exclusively to determine discontinuity.

BUG=351489
R=dalecurtis@chromium.org
TEST=No media_unittest, layout, or yt-dash-mse ToT conformance regression. Fixes b/17570928.

Committed: https://crrev.com/674907fe07fc1b26b19f41f63ad70bca78665a7b
Cr-Commit-Position: refs/heads/master@{#296599}

[wolenetz, 2014-09-24 23:11:27]

PTAL. Thanks!

[DaleCurtis, 2014-09-25 00:28:05]

lgtm, accurate durations can't come soon enough! whatever happened to tbutter's
patch?

[wolenetz, 2014-09-25 00:48:43]

On 2014/09/25 00:28:05, DaleCurtis wrote:
> lgtm, accurate durations can't come soon enough! whatever happened to
tbutter's
> patch?

Hear-hear! :) It's on my plate for in-depth CR. It's non-trivial.

[wolenetz, 2014-09-25 00:48:44]

On 2014/09/25 00:28:05, DaleCurtis wrote:
> lgtm, accurate durations can't come soon enough! whatever happened to
tbutter's
> patch?

Hear-hear! :) It's on my plate for in-depth CR. It's non-trivial.

[wolenetz, 2014-09-25 00:49:03]

The CQ bit was checked by wolenetz@chromium.org

[commit-bot: I haz the power, 2014-09-25 00:49:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/597293004/1

[commit-bot: I haz the power, 2014-09-25 00:56:10]

Committed patchset #1 (id:1) as b6a27724c923b2c1368b37f1d96bc8cdc14d07c6

[commit-bot: I haz the power, 2014-09-25 00:56:51]

Patchset 1 (id:??) landed as
https://crrev.com/674907fe07fc1b26b19f41f63ad70bca78665a7b
Cr-Commit-Position: refs/heads/master@{#296599}