MSE: Maintain continuity in sequence appendMode across ResetParserState

MSE: Maintain continuity in sequence appendMode across ResetParserState

This change fixes Chromium to match the expected fix for MSE spec bug
29133 (which has a pull request with the associated spec language update
pending review at https://github.com/w3c/media-source/pull/9).

BUG=533113
TEST=FrameProcessorTest.AudioOnly_SequenceModeContinuityAcrossReset
R=chcunningham@chromium.org

Committed: https://crrev.com/eb774ca399d680db7885a01ce5cf48eb1260f57b
Cr-Commit-Position: refs/heads/master@{#349581}

[wolenetz, 2015-09-17 22:40:45]

Please take a look.
Thanks!

[wolenetz, 2015-09-17 22:48:13]

On 2015/09/17 22:40:45, wolenetz wrote:
> Please take a look.
> Thanks!

Note, as expected, the new test fails without the corresponding change to the
FrameProcessor::Reset() implementation:

./../media/filters/frame_processor_unittest.cc:748: tried expectation #0:
EXPECT_CALL(callbacks_, PossibleDurationIncrease(frame_duration_))...
  Expected arg #0: is equal to 0.01s
           Actual: 0.11s
         Expected: to be called once
           Actual: called once - saturated and active
../../media/filters/frame_processor_unittest.cc:751: tried expectation #1:
EXPECT_CALL(callbacks_, PossibleDurationIncrease(frame_duration_ * 2))...
  Expected arg #0: is equal to 0.02s
           Actual: 0.11s
         Expected: to be called once
           Actual: never called - unsatisfied and active
../../media/filters/frame_processor_unittest.cc:754: Failure
Value of: timestamp_offset_
  Actual: 0s
Expected: frame_duration_ * -9
Which is: -0.09s
../../media/filters/frame_processor_unittest.cc:171: Failure
Value of: ss.str()
  Actual: "{ [0,110) }"
Expected: expected
Which is: "{ [0,20) }"
../../media/filters/frame_processor_unittest.cc:239: Failure
Value of: ss.str()
  Actual: "0 100"
Expected: expected
Which is: "0 10:100"
../../media/filters/frame_processor_unittest.cc:751: Failure
Actual function call count doesn't match EXPECT_CALL(callbacks_,
PossibleDurationIncrease(frame_duration_ * 2))...
         Expected: to be called once
           Actual: never called - unsatisfied and active
[  FAILED  ] FrameProcessorTest.AudioOnly_SequenceModeContinuityAcrossReset (2
ms)

[wolenetz, 2015-09-17 22:48:40]

The CQ bit was checked by wolenetz@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-17 22:50:49]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1355673004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1355673004/1

[chcunningham, 2015-09-18 00:08:39]

lgtm

[wolenetz, 2015-09-18 00:09:24]

The CQ bit was unchecked by wolenetz@chromium.org

[wolenetz, 2015-09-18 00:09:35]

The CQ bit was checked by wolenetz@chromium.org

[commit-bot: I haz the power, 2015-09-18 00:11:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1355673004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1355673004/1

[commit-bot: I haz the power, 2015-09-18 01:46:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-18 01:46:46]

Patchset 1 (id:??) landed as
https://crrev.com/eb774ca399d680db7885a01ce5cf48eb1260f57b
Cr-Commit-Position: refs/heads/master@{#349581}