This reduces the number of objects when not specifying a
build target during compile. This is especially significant for Android
where the number of objects decreases from 3322 to 1761.

BUG=libyuv:644
R=fbarchard@google.com

Review URL: https://codereview.chromium.org/2395743002 .

Optimize max enables O2 for official builds.  Normally release builds
are O2 but the official build is Os, affecting performance.
The GYP file was previously updated to enable optimize max,
which enables ltcg and O2.

Documentation updated to show GN builds in docs/getting_started.md

BUG=libyuv:642
R=kjellander@chromium.org

Review URL: https://codereview.chromium.org/2386093003 .

R=fbarchard@google.com
BUG=libyuv:634

Performance gains :-

I422ToYUY2Row_MSA     - ~12x
I422ToYUY2Row_Any_MSA - ~7x

I422ToUYVYRow_MSA     - ~12x
I422ToUYVYRow_Any_MSA - ~7x

Review URL: https://codereview.chromium.org/2378753004 .

Low level support for 12 bit 420, 422 and 444 YUV video frame conversion.

BUG=libyuv:560, chromium:445071
TEST=LibYUVPlanarTest.TestHalfFloatPlane on windows
R=hubbe@chromium.org, wangcheng@google.com

Review URL: https://codereview.chromium.org/2387713002 .

Low level support for 12 bit 420, 422 and 444 YUV video frame conversion.

BUG=libyuv:560, chromium:445071
TEST=untested
R=hubbe@chromium.org

Review URL: https://codereview.chromium.org/2381493006 .

BUG=libyuv:560,chromium:445071
TEST=untested
R=hubbe@chromium.org

Review URL: https://codereview.chromium.org/2371293002 .

Original bt709 color space coefficients were full range yuv for higher
quality.  This change makes the coefficients use the video constrained
color space the same as bt601 which is 16 to 240 for Y and 16 to 235 for
chroma channels.

BUG=libyuv:639
TEST=libyuv unittests run locally
R=hubbe@chromium.org

Review URL: https://codereview.chromium.org/2367253003 .

BUG=libyuv:560
TEST=local compile for windows
R=wangcheng@google.com

Review URL: https://codereview.chromium.org/2364293002 .

Remove NOLINT from guards

TEST=git cl lint
BUG=libyuv:634

Review URL: https://codereview.chromium.org/2374653002 .

Signed vectors are rarely used in libyuv... remove macros for now.
Remove word shuffler, use byte shuffler in row_msa.
Bump version number.

TBR=manojkumar.bhosale@imgtec.com
BUG=libyuv:634

Review URL: https://codereview.chromium.org/2375553002 .

This patch adds MSA optimized ARGBMirrorRow function in libYUV project.

Performance gain ~3x

R=fbarchard@google.com
BUG=libyuv:634

Review URL: https://codereview.chromium.org/2368313003 .

Instead of creating symlinks on Windows, the script is now:
* creating a junction for directories
* copying individual files.

This makes 'gclient sync' and 'gclient runhooks' no longer
require administrator's privileges.
If the script is run with administrator's privileges, a
warning will be printed, informing the user that it's not recommended.

Also clean up a few old documentation references to the
Chromium SVN->Git transition.

BUG=libyuv:584,webrtc:4911
TESTED=Running the script with+without administrator's privileges.
I also tested the case of this change being rolled back, in which
case I verified that the copied files are still being deleted using
the same cleanup code path as the previous symlinks.
NOTRY=True
R=braveyao@chromium.org

Review URL: https://codereview.chromium.org/2359383002 .

follow up warning fixs
cpu_id.cc(167): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
lint warning: cpu_id.cc:171:  Missing space before ( in if(  [whitespace/parens] [5]

TBR=manojkumar.bhosale@imgtec.com
BUG=libyuv:634
TEST=try bots for windows.

Review URL: https://codereview.chromium.org/2365813002 .

As per the preparation patch added in Chromium sources at,
2150943003: Add MIPS SIMD Arch (MSA) build flags for GYP/GN builds

This patch adds first MSA optimized function in libYUV project.

BUG=libyuv:634
R=fbarchard@google.com

Review URL: https://codereview.chromium.org/2285683002 .

TBR=kjellander@chromium.org
BUG=libyuv:637, chromium:646279

Review URL: https://codereview.chromium.org/2340933005 .

../../source/scale_neon.cc:576:1: error: multi-line comment [-Werror=comment]
 // #define BLENDER(a, b, f) (uint8)((int)(a) + \
 ^

BUG=None
TEST=try bots

Review URL: https://codereview.chromium.org/2344203003 .

BUG=libyuv:635
TEST=try bots
R=harryjin@google.com

Review URL: https://codereview.chromium.org/2347733002 .

BUG=None
TEST=try bots

Review URL: https://codereview.chromium.org/2346633002 .

BUG=libyuv:636
TESTED=try bots
R=kjellander@chromium.org

Review URL: https://codereview.chromium.org/2339813002 .

BUG=libyuv:523
R=fbarchard@google.com, kjellander@chromium.org, magjed@chromium.org

Review URL: https://codereview.chromium.org/2317073002 .

Change log: https://chromium.googlesource.com/chromium/src/+log/33f87688..94111882
Full diff: https://chromium.googlesource.com/chromium/src/+/33f87688..94111882

TBR=kjellander@chromium.org
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2292373002 .

On visual c 2013 and earlier a warning is generated if externs
are not declared with the same alignment as the declaration, when
using /ltcg

BUG=libyuv:633
TEST=standalong test built with cl /Bv /GL /Ox /nologo a.cc b.cc /link /ltcg
R=skal@google.com

Review URL: https://codereview.chromium.org/2291533004 .

Add test for SplitUVPlane and MergeUVPlane

Add public methods SplitUVPlanes and MergeUVPlanes based on the
optimized assembly functions that already exists.

TEST=SplitUVPlane unittest
BUG=libyuv:629
R=braveyao@chromium.org

Review URL: https://codereview.chromium.org/2279603002 .

Add public methods SplitUVPlanes and MergeUVPlanes based on the
optimized assembly functions that already exists. Also, de-duplicate the
CPU dispatching code for these functions by moving them to helper
functions.

BUG=libyuv:629
R=braveyao@chromium.org

Review URL: https://codereview.chromium.org/2277603004 .

BUG=libyuv:631
TEST=unittests build/pass
R=harryjin@google.com

Review URL: https://codereview.chromium.org/2271053003 .

The conversion from NV12 and other Bi or Tri planar formats, differs only in the UV handling.  The helper function supports passing a NULL for the dst_y channel indicating you only want to do the UV conversion.

TBR=harryjin@google.com
TEST=LibYUVConvertTest.NV12ToI420_NullY (601 ms)
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2276703002 .

TBR=magjed@chromium.org
BUG=libyuv:629
TEST=LibYUVConvertTest.NV12ToI420_Opt

Review URL: https://codereview.chromium.org/2267303002 .

TBR=harryjin@google.com
BUG=libyuv:630
TEST=local build and try bots pass

Review URL: https://codereview.chromium.org/2264293002 .

BUG=libyuv:630

TBR=harryjin@google.com
TEST=android build locally tested.

Review URL: https://codereview.chromium.org/2225763003 .

Review URL: https://codereview.chromium.org/2269793002 .

BUG=libyuv:626

Review URL: https://codereview.chromium.org/2225763003 .

Add a lot of new dependencies for the Android toolchain
to setup_links.py (added for WebRTC in https://codereview.webrtc.org/2190893002
and https://codereview.webrtc.org/2215633002).

There was no other way to get the Android test to build
than renaming the APK to yuv_unittests. That made it possible
to use build/apk_test.gypi (there's some bug somewhere that assumes
names doesn't start with "lib", see http://crbug.com/543820).

TBR=fbarchard@chromium.org
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2201893007 .

contains the following changes in chromium:
https://chromium.googlesource.com/chromium/src/+log/2d938c84..7fa6701b

R=kjellander@chromium.org
TBR=kjellander@chromium.org
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2183633002 .

This dependency doesn't exist in the gyp build either, and it causes
problems on builds building 'all'.

BUG=633316
R=kjellander@chromium.org

Review URL: https://codereview.chromium.org/2201963002 .

contains the following changes in chromium:
https://chromium.googlesource.com/chromium/src/+log/2d938c84..08680295

R=kjellander@chromium.org
TBR=kjellander@chromium.org
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2183663002 .

Change log: https://chromium.googlesource.com/chromium/src/+log/aa5126ff66..2d938c84f9
Full diff: https://chromium.googlesource.com/chromium/src/+/aa5126ff66..2d938c84f9

No dependencies changed.
No update to Clang.

R=kjellander@chromium.org
TBR=kjellander@chromium.org
BUG=libyuv:626,libyuv:627

Review URL: https://codereview.chromium.org/2182633005 .

We have discovered that this should increase build performance in some cases.

http://crbug.com/627637

R=fbarchard@google.com

Review URL: https://codereview.chromium.org/2163213005 .

This reverts commit a817c152.

TBR=kjellander@chromium.org
BUG=libyuv:626, webrtc:5990

Review URL: https://codereview.chromium.org/2161923003 .

This reverts commit 81d6597d.
Breaks android builds.
ninja: error: '../../testing/android/native_test/java/AndroidManifest.xml', needed by 'libyuv_unittest_apk/libyuv_unittest_apk.resources.zip', missing and no known rule to make it

R=kjellander@chromium.org
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2159053002 .

A fix was needed to make Android tests pass after
https://codereview.chromium.org/2043803003

Change log: https://chromium.googlesource.com/chromium/src/+log/7fa6701bc5..1a73d11e65
Full diff: https://chromium.googlesource.com/chromium/src/+/7fa6701bc5..1a73d11e65

Changed dependencies:
* src/buildtools: https://chromium.googlesource.com/chromium/buildtools.git/+log/8dd3c8e39a..099f1da55b
* src/third_party/boringssl/src: https://boringssl.googlesource.com/boringssl.git/+log/0fc7df55c0..171b5403ee
* src/third_party/ffmpeg: https://chromium.googlesource.com/chromium/third_party/ffmpeg.git/+log/7f03319b9d..bcb8b67b8b
DEPS diff: https://chromium.googlesource.com/chromium/src/+/7fa6701bc5..1a73d11e65/DEPS

No update to Clang.

TBR=kjellander@chromium.org
BUG=libyuv:626,webrtc:5990

Review URL: https://codereview.chromium.org/2156913004 .

contains the following changes in chromium:
https://chromium.googlesource.com/chromium/src/+log/aa5126ff..7fa6701b

some trybot scripts failing.  build bots green before roll.  Will see if commit causes build bot failure.

TBR=kjellander@chromium.org
BUG=libyuv:626

Review URL: https://codereview.chromium.org/2146073004 .