Roll up of playback rate efficiency improvements for M56.

Roll up of playback rate efficiency improvements for M56.

532a5dc Fix implicit channel layout configurations at non-1.0 playback rates.
fe0d379 Lazily allocate WSOLA structures; saves 56kB to 765kB of memory.
d99d0fa Add SSE and NEON intrinsics for WSOLA's MultiChannelDotProduct().
2c82957 Don't run WSOLA over always muted channels

BUG=666813
(cherry picked from commit a2cf799e795b7125776e6d58f1bb384c465c4c18)

Committed: https://chromium.googlesource.com/chromium/src/+/ce3455666136ca3e39c66aab13e53da72249b26d

[DaleCurtis, 2016-11-30 23:28:43]

Description was changed from

==========
Roll up of playback rate efficiency improvements for M56.

532a5dc Fix implicit channel layout configurations at non-1.0 playback rates.
fe0d379 Lazily allocate WSOLA structures; saves 56kB to 765kB of memory.
d99d0fa Add SSE and NEON intrinsics for WSOLA's MultiChannelDotProduct().
2c82957 Don't run WSOLA over always muted channels

BUG=666813

(cherry picked from commit a2cf799e795b7125776e6d58f1bb384c465c4c18)
==========

to

==========
Roll up of playback rate efficiency improvements for M56.

532a5dc Fix implicit channel layout configurations at non-1.0 playback rates.
fe0d379 Lazily allocate WSOLA structures; saves 56kB to 765kB of memory.
d99d0fa Add SSE and NEON intrinsics for WSOLA's MultiChannelDotProduct().
2c82957 Don't run WSOLA over always muted channels

BUG=666813

(cherry picked from commit a2cf799e795b7125776e6d58f1bb384c465c4c18)

Committed:
https://chromium.googlesource.com/chromium/src/+/ce3455666136ca3e39c66aab13e5...
==========

[DaleCurtis, 2016-11-30 23:28:44]

Committed patchset #1 (id:1) manually as
ce3455666136ca3e39c66aab13e53da72249b26d.