Merge M56: "Fail decodeAudioFileData() when duration is unknown."

Merge M56: "Fail decodeAudioFileData() when duration is unknown."

This API as currently written can only work with streams of a
known duration, so explicitly fail instead of misinterpreting
a massive 64-bit value as the actual duration.

BUG=668849
TEST=new unittest and layout test.

Review-Url: https://codereview.chromium.org/2537603003
Cr-Commit-Position: refs/heads/master@{#435118}
(cherry picked from commit f7f6a8ef3024fe72f77d74426e69a8f3fa54c3f5)

Committed: https://chromium.googlesource.com/chromium/src/+/06a5c7686f5355f8b173060567d033e552cbebbd

[DaleCurtis, 2016-12-01 01:25:14]

Description was changed from

==========
Merge M56: "Fail decodeAudioFileData() when duration is unknown."

This API as currently written can only work with streams of a
known duration, so explicitly fail instead of misinterpreting
a massive 64-bit value as the actual duration.

BUG=668849
TEST=new unittest and layout test.

Review-Url: https://codereview.chromium.org/2537603003
Cr-Commit-Position: refs/heads/master@{#435118}
(cherry picked from commit f7f6a8ef3024fe72f77d74426e69a8f3fa54c3f5)
==========

to

==========
Merge M56: "Fail decodeAudioFileData() when duration is unknown."

This API as currently written can only work with streams of a
known duration, so explicitly fail instead of misinterpreting
a massive 64-bit value as the actual duration.

BUG=668849
TEST=new unittest and layout test.

Review-Url: https://codereview.chromium.org/2537603003
Cr-Commit-Position: refs/heads/master@{#435118}
(cherry picked from commit f7f6a8ef3024fe72f77d74426e69a8f3fa54c3f5)

Committed:
https://chromium.googlesource.com/chromium/src/+/06a5c7686f5355f8b173060567d0...
==========

[DaleCurtis, 2016-12-01 01:25:15]

Committed patchset #1 (id:1) manually as
06a5c7686f5355f8b173060567d033e552cbebbd.