remove I422ToBGRA and use I422ToRGBA internally

remove I422ToBGRA and use I422ToRGBA internally

Removes low levels for I420ToBGRA and I420ToRAW and reimplements them as I420ToRGBA and I420ToRGB24 with transposed color matrix.

Adds unittests that do 1 step conversion vs 2 steps to test end swapping versions match direct conversions.

R=harryjin@google.com
BUG=libyuv:518
Committed: https://chromium.googlesource.com/libyuv/libyuv/+/2c7aa0070a2944fa311367f3b5ce4c8b069f1104

[fbarchard, 2015-11-02 12:05:32]

Description was changed from

==========
remove I422ToBGRA and use I422ToRGBA internally

R=harryjin@google.com
BUG=libyuv:518
==========

to

==========
remove I422ToBGRA and use I422ToRGBA internally

Removes low levels for I420ToBGRA and I420ToRAW and reimplements them as
I420ToRGBA and I420ToRGB24 with transposed color matrix.

Adds unittests that do 1 step conversion vs 2 steps to test end swapping
versions match direct conversions.

R=harryjin@google.com
BUG=libyuv:518
==========

[fbarchard, 2015-11-02 12:05:32]

fbarchard@chromium.org changed reviewers:
+ xhwang@chromium.org

[fbarchard, 2015-11-02 12:06:23]

fbarchard@chromium.org changed reviewers:
+ fbarchard@chromium.org

[fbarchard, 2015-11-02 12:06:23]

13 files changed, 222 insertions(+), 968 deletions(-)
[==========] 950 tests from 6 test cases ran. (4347 ms total)
[  PASSED  ] 950 tests.

[harryjin, 2015-11-02 17:47:58]

lgtm

[fbarchard1, 2015-11-02 18:24:16]

Committed patchset #3 (id:40001) manually as
2c7aa0070a2944fa311367f3b5ce4c8b069f1104 (presubmit successful).