Raw 24 bit RGB to RGB24 (bgr)

Raw 24 bit RGB to RGB24 (bgr)

Add unittests that do 1 step conversion vs 2 step conversion.

Tests end swapping versions match direct conversions.

R=harryjin@google.com
BUG=libyuv:518
Committed: https://chromium.googlesource.com/libyuv/libyuv/+/ce4c2fad1d71f6e4bed20e3a7e518397a44a7e04

[fbarchard, 2015-11-03 02:07:23]

fbarchard@chromium.org changed reviewers:
+ fbarchard@chromium.org, xhwang@chromium.org
- harryjin@google.com

[fbarchard, 2015-11-03 02:07:24]

RAWToRGB24 - end swap RGB 24 bit.  Allows 2 step conversions and tests.

[fbarchard, 2015-11-03 02:08:28]

SSSE3 version is about same speed as RAWToARGB
[       OK ] LibYUVConvertTest.RAWToARGB_Opt (242 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Opt (222 ms)

[fbarchard, 2015-11-03 02:23:28]

ARMv7 version
[       OK ] LibYUVConvertTest.RAWToRGB24_Any (1285 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Opt (1150 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Invert (1130 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Unaligned (1055 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Random (70 ms)
a bit faster than ARGB
[       OK ] LibYUVConvertTest.RAWToARGB_Any (1338 ms)
[       OK ] LibYUVConvertTest.RAWToARGB_Opt (1186 ms)
[       OK ] LibYUVConvertTest.RAWToARGB_Invert (1153 ms)
[       OK ] LibYUVConvertTest.RAWToARGB_Unaligned (1026 ms)
[       OK ] LibYUVConvertTest.RAWToARGB_Random (72 ms)

[fbarchard, 2015-11-03 02:27:40]

aarch64 version
[       OK ] LibYUVConvertTest.RAWToRGB24_Any (1188 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Unaligned (1185 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Opt (1154 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Invert (1147 ms)
[       OK ] LibYUVConvertTest.RAWToRGB24_Random (70 ms)

[harryjin, 2015-11-03 07:57:21]

harryjin@google.com changed reviewers:
+ harryjin@google.com

[harryjin, 2015-11-03 07:57:21]

lgtm

[fbarchard1, 2015-11-03 18:30:34]

Committed patchset #3 (id:40001) manually as
ce4c2fad1d71f6e4bed20e3a7e518397a44a7e04 (presubmit successful).