Publishing a new ANGLE NuGet version

1. Clone https://github.com/servo/ms-angle/ and checkout the most recent servo-master-YYYY-MM-DD branch
2. Rebase against a particular revision of https://github.com/google/angle/, run gclient sync
3. Based on https://chromium.googlesource.com/angle/angle/+/master/doc/DevSetup.md:
4. gn args out/Release-x64 [1]
5. gn args out/Release-x86 [2]
6. gn args out/Release-arm64 [3]
7. gn args out/Debug-x64 [1] but with is_debug = true
8. gn args out/Debug-x86 [2] but with is_debug = true
9. gn args out/Debug-arm64 [2] but with is_debug = true
10. autoninja -C out/Release-x64
11. autoninja -C out/Release-x86
12. autoninja -C out/Release-arm64
13. autoninja -C out/Debug-x64
14. autoninja -C out/Debug-x86
15. autoninja -C out/Debug-arm64
16. Increment the version number in nuget/angle.nuspec
17. nuget pack nuget/angle.nuspec -Properties Configuration=Release
18. nuget pack nuget/angle.nuspec -Properties Configuration=Debug -Suffix debug
19. Upload the resulting packages to https://www.nuget.org/packages/manage/upload
20. Push to a new servo-master-YYYY-MM-DD branch

---

[1]

target_os = "winuwp"
is_debug = false
is_clang = false

[2]

target_os = "winuwp"
target_cpu = "x86"
is_clang = false
is_debug = false

[3]

target_os = "winuwp"
target_cpu = "arm64"
is_clang = false
is_debug = false