Allows us to ignore flags passed on to us by Chromium build bots
without having to explicitly disable them. (Thanks pbos!)

TESTED=webrtc ran modules_unittests with a bogus flag did not result in an
error.

R=kjellander@chromium.org
BUG=libyuv:507

Review URL: https://codereview.chromium.org/1417573002 .

The DEPS entry for gflags added in https://codereview.chromium.org/1413723002/
assumed the Chromium/WebRTC checkout layout with 'src' as the
top-directory name. That doesn't work for libyuv, since the top-directory
is named 'libyuv'.

BUG=libyuv:507

Review URL: https://codereview.chromium.org/1410673004 .

files needed for command line support with gtest.
These files are copied directly from webrtc.

TBR=kjellander@chromium.org
BUG=libyuv:507

Review URL: https://codereview.chromium.org/1414483002 .

Unit tests currently use environment variables to change behavior.
Using gflags this can be done via command line.

BUG=libyuv:507
TBR=fbarchard@chromium.org

Review URL: https://codereview.chromium.org/1413723002 .

This reverts commit 2dd3d923.

Reason: chromium_git is a missing variable, and to properly
add gflags, we need to check in GYP files in third_party/gflags
first, then add the DEPS entry.

BUG=libyuv:507
TBR=fbarchard@chromium.org

Review URL: https://codereview.chromium.org/1406323002 .

unittests currently use environment variables to change behavior.
using gflags this can be done via command line.

R=kjellander@chromium.org
BUG=libyuv:507

Review URL: https://codereview.chromium.org/1402313002 .

This test is just a printf, not a real test, but somehow
fails on arm.

TBR=harryjin@google.com
BUG=libyuv:506

Review URL: https://codereview.chromium.org/1409913002 .

R=harryjin@google.com
BUG=libyuv:507

Review URL: https://codereview.chromium.org/1410643002 .

YuvPixel for arm was miscomputing YG.

TBR=harryjin@google.com
BUG=libyuv:506

Review URL: https://codereview.chromium.org/1402333002 .

TBR=harryjin@google.com
BUG=libyuv:506

Review URL: https://codereview.chromium.org/1403183002 .

A hang in color conversion on arm occurs somewhere in yuv to rgb.
Breaking the color test into its own category of test will help
run selective tests to narrow down the issue.

R=harryjin@google.com
BUG=libyuv:506

Review URL: https://codereview.chromium.org/1405543003 .

These tests are place holders, but cause a hang on arm.
Disable them for now.

TBR=harryjin@google.com
BUG=libyuv:506

Review URL: https://codereview.chromium.org/1407693003 .

R=sergeyu@chromium.org
BUG=chromium:538243

Review URL: https://codereview.chromium.org/1396363004 .

R=harryjin@google.com
BUG=none

Review URL: https://codereview.chromium.org/1399523004 .

Roll chromium_revision bfea27a..bb79186 (340499:353481) in DEPS.
Changes: https://chromium.googlesource.com/chromium/src/+log/bfea27a..bb79186

To get the Android dependencies, you need to have
target_os = ["android"];
added to the end of your .gclient file (after the solution specs)
+ re-run gclient sync.
You'll also need to run: build/install-android-sdks.sh

Then build and run the test with something like this:
GYP_CROSSCOMPILE=1 GYP_DEFINES="OS=android component=static_library target_arch=arm" ./gyp_libyuv
ninja -C out/Release libyuv_unittest_apk
util/android/test_runner.py gtest -s libyuv_unittest --verbose --release

R=fbarchard@chromium.org

Review URL: https://codereview.chromium.org/1398383003 .

PNaCl code validation fails when compiling with -O0 due to the linked
bug. Always enable optimization when compiling for NaCl to workaround
this bug.

BUG=538243
R=fbarchard@chromium.org

Review URL: https://codereview.chromium.org/1403813002 .

fill in aarch64 yuv constants to match how the code expects them.

TBR=harryjin@google.com
BUG=libyuv:502

Review URL: https://codereview.chromium.org/1396253004 .

TBR=harryjin@google.com
BUG=none

Review URL: https://codereview.chromium.org/1398633002 .

previously the neon source code was broken into a separate
library built with -mfpu=neon for the neon assembly, while
the C code was built without neon.

In this change, the neon code is added to the main library
and all code built with neon.

TBR=harryjin@google.com
BUG=libyuv:371

Review URL: https://codereview.chromium.org/1392043003 .

yuv constants for bt.601 were previously ported to neon64, as well
as the code to respect other color spaces.  But the jpeg and bt.709
colour conversion constants were still in armv7 form.  This changes
the constants for aarch64 builds to be compatible with the code.

yuv constants are now passed as const *

Remove Yvu constants which were used for older version on nv21 but not new code.

TBR=harryjin@google.com
BUG=none

Review URL: https://codereview.chromium.org/1398623002 .

Fix for 64 bit gcc parameter in dither function which requires m not r,
when ABI uses register.

BUG=none

Review URL: https://codereview.chromium.org/1399463002 .

Previously the assembly code was only available to Windows.
This CL ports the AVX2 code to GCC syntax.

TBR=harryjin@google.com
BUG=libyuv:492

Review URL: https://codereview.chromium.org/1391273003 .

Previously the assembly code was only available to Windows.
This CL ports the SSE2 code to GCC syntax.

When running a profiler on all the unittests, this function
was the slowest of all functions that still ran in C code.
   3.71%  libyuv_unittest  libyuv_unittest      [.] ARGBToRGB565DitherRow_C

Was
ARGBToRGB565Dither_Opt (2894 ms)
Now
ARGBToRGB565Dither_Opt (432 ms)

TBR=harryjin@google.com
BUG=libyuv:492

Review URL: https://codereview.chromium.org/1397673002 .

offset to second group of pixels was off by 16.
should have been 32, not 16.
requires avx2 hardware and wide image for test.

R=harryjin@google.com
TBR=harryjin@google.com
BUG=libyuv:492,libyuv:501

Review URL: https://codereview.chromium.org/1395603002 .

SETUP provided by zhongwei.yao@linaro.org

Previously the 64 bit Neon code had hard coded constants in the setup macro
for YUV conversion, while 32 bit Neon code supported the yuvconstants
parameter.

This change accepts the constants passed to the YUV conversion row function,
allowing different color spaces to be respected - naming JPEG and BT.709.
As well as the existing BT.601.

TBR=harryjin@google.com
BUG=libyuv:472

Review URL: https://codereview.chromium.org/1384323002 .

Low level for NV21ToARGB written to accept yuv matrix used by
other YUV to ARGB functions.
Previously NV21 was implemented for Windows using NV12 with a different
matrix that swapped U and V.  But the Arm version of the low level does
not allow the matrix U and V contributions to be swapped.
Using a new low level function that reads NV21 and uses the same
yuvconstants as other YUV conversion functions allows an Arm port of
this function.

TBR=harryjin@google.com
BUG=libyuv:500

Review URL: https://codereview.chromium.org/1388273002 .

TBR=harryjin@google.com
BUG=libyuv:492

Review URL: https://codereview.chromium.org/1392803002 .

J444 is JPeg YUV color space with 444 subsampling.
This implementation uses the existing I444ToARGB conversion, which is
BT.601 color space with 444 subsampling, but passing in the jpeg
color matrix constants.

TBR=harryjin@google.com
BUG=449

Review URL: https://codereview.chromium.org/1387313002 .

TBR=harryjin@google.com
BUG=libyuv:492

Review URL: https://codereview.chromium.org/1393653002 .

R=harryjin@google.com
BUG=libyuv:492

Review URL: https://codereview.chromium.org/1367403007 .

R=agl@chromium.org, harryjin@google.com
BUG=libyuv:497

Review URL: https://codereview.chromium.org/1382803002 .

ARGBBlendRow_SSE2, ARGBAttenuateRow_SSE2, and MirrorRow_SSE2
Since vast majority of CPUs have SSSE3 now, removing the SSE2
improves the performance of CPU dispatching.

R=harryjin@google.com
BUG=none

Review URL: https://codereview.chromium.org/1377053003 .

Code runs out of registers on 32 bit fpic builts.

TBR=harryjin@google.com
BUG=libyuv:496

Review URL: https://codereview.chromium.org/1369053002 .

Was
I420AlphaToARGB_Premult (8861 ms)
I420AlphaToARGB_Opt (7119 ms)
Now
I420AlphaToABGR_Premult (2840 ms)
I420AlphaToARGB_Opt (484 ms)

C function switched to 1 step.
Was
I420AlphaToARGB_Premult (8862 ms)
I420AlphaToABGR_Opt (6718 ms)

Now
I420AlphaToARGB_Premult (8706 ms)
I420AlphaToARGB_Opt (6541 ms)

R=harryjin@google.com
BUG=libyuv:496, libyuv:473

Review URL: https://codereview.chromium.org/1359183003 .

C     I420AlphaToARGB_Opt (5169 ms)
SSSE3 I420AlphaToARGB_Opt (432 ms)
AVX2  I420AlphaToARGB_Opt (358 ms)

and with premultiplication as 2 step process:
I420AlphaToARGB_Premult (7029 ms)
I420AlphaToARGB_Premult (757 ms)
I420AlphaToARGB_Premult (508 ms)

R=harryjin@google.com
BUG=libyuv:496,libyuv:473

Review URL: https://codereview.chromium.org/1372653003 .

API change - I420AlphaToARGB takes flag indicating if RGB should be
premultiplied by alpha.

This version implements an efficient SSSE3 version for Windows.
C version done in 2 steps.

Was
libyuvTest.I420AlphaToARGB_Any (1136 ms)
libyuvTest.I420AlphaToARGB_Unaligned (1210 ms)
libyuvTest.I420AlphaToARGB_Invert (966 ms)
libyuvTest.I420AlphaToARGB_Opt (1031 ms)
libyuvTest.I420AlphaToABGR_Any (1020 ms)
libyuvTest.I420AlphaToABGR_Unaligned (1359 ms)
libyuvTest.I420AlphaToABGR_Invert (1082 ms)
libyuvTest.I420AlphaToABGR_Opt (986 ms)

R=harryjin@google.com
BUG=libyuv:496

Review URL: https://codereview.chromium.org/1367093002 .

ebx encodes more efficiently (1 byte less) for most address modes, than ebp.
previously it was used for 411 format, but the reader uses pinsrw now avoiding
gpr register.

BUG=libyuv:488
R=harryjin@google.com

Review URL: https://codereview.chromium.org/1365003003 .

Should be 16 bytes, but was 0x16 causing memory corruption.

TBR=harryjin@google.com
BUG=libyuv:492

Review URL: https://codereview.chromium.org/1368693002 .

TBR=harryjin@google.com
BUG=none

Review URL: https://codereview.chromium.org/1364913002 .

Includes UYVYToARGB ssse3 fix.

Was
YUY2ToARGB_Opt (433 ms)
69.79%  libyuv_unittest  libyuv_unittest      [.] I422ToARGBRow_AVX2
20.73%  libyuv_unittest  libyuv_unittest      [.] YUY2ToUV422Row_AVX2
 6.04%  libyuv_unittest  libyuv_unittest      [.] YUY2ToYRow_AVX2
 0.77%  libyuv_unittest  libyuv_unittest      [.] YUY2ToARGBRow_AVX2

Now
YUY2ToARGB_Opt (280 ms)
95.66%  libyuv_unittest  libyuv_unittest      [.] YUY2ToARGBRow_AVX2

BUG=libyuv:494
R=harryjin@google.com

Review URL: https://codereview.chromium.org/1364813002 .