Never reuse a VideoToolbox decompression session.

Never reuse a VideoToolbox decompression session.

Due to bugs in VTDecompressionSessionCanAcceptFormatDescription(),
remove the logic that reuses decompression sessions and always create a
new one. Tighten up the change detection to only trigger on keyframes.

BUG=555043
Original review URL: https://codereview.chromium.org/1437153010

(cherry picked from commit 07c07c368ccf43348058f771e95759b58921d6cc)

R=watk@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/5fae2532d04f36f1fb9d16000745177465de5554

[sandersd (OOO until July 31), 2015-11-25 19:37:36]

Description was changed from

==========
Never reuse a VideoToolbox decompression session.

Due to bugs in VTDecompressionSessionCanAcceptFormatDescription(),
remove the logic that reuses decompression sessions and always create a
new one. Tighten up the change detection to only trigger on keyframes.

BUG=555043

Original review URL: https://codereview.chromium.org/1437153010

(cherry picked from commit 07c07c368ccf43348058f771e95759b58921d6cc)
==========

to

==========
Never reuse a VideoToolbox decompression session.

Due to bugs in VTDecompressionSessionCanAcceptFormatDescription(),
remove the logic that reuses decompression sessions and always create a
new one. Tighten up the change detection to only trigger on keyframes.

BUG=555043

Original review URL: https://codereview.chromium.org/1437153010

(cherry picked from commit 07c07c368ccf43348058f771e95759b58921d6cc)
==========

[sandersd (OOO until July 31), 2015-11-25 19:37:36]

sandersd@chromium.org changed reviewers:
+ watk@chromium.org

[watk, 2015-11-25 19:40:44]

lgtm

[sandersd (OOO until July 31), 2015-11-25 19:43:52]

Description was changed from

==========
Never reuse a VideoToolbox decompression session.

Due to bugs in VTDecompressionSessionCanAcceptFormatDescription(),
remove the logic that reuses decompression sessions and always create a
new one. Tighten up the change detection to only trigger on keyframes.

BUG=555043

Original review URL: https://codereview.chromium.org/1437153010

(cherry picked from commit 07c07c368ccf43348058f771e95759b58921d6cc)
==========

to

==========
Never reuse a VideoToolbox decompression session.

Due to bugs in VTDecompressionSessionCanAcceptFormatDescription(),
remove the logic that reuses decompression sessions and always create a
new one. Tighten up the change detection to only trigger on keyframes.

BUG=555043

Original review URL: https://codereview.chromium.org/1437153010

(cherry picked from commit 07c07c368ccf43348058f771e95759b58921d6cc)

R=watk@chromium.org

Committed:
https://chromium.googlesource.com/chromium/src/+/5fae2532d04f36f1fb9d16000745...
==========

[sandersd (OOO until July 31), 2015-11-25 19:43:53]

Committed patchset #1 (id:1) manually as
5fae2532d04f36f1fb9d16000745177465de5554 (presubmit successful).