roll gyp 1927:1944
roll gyp 1927:1944

1928: use all processors instead of hard-coded 8.
1929: Fix msvs-ninja clean build command / target.
1930: ninja: Add option for link concurrency.
1931: Add unittest for 'AR' in 'make_global_settings'
1932: Override the user's language settings during tests
1933: ninja win: Remove old comment, check cc/cxx are always overridden
1934: Use context manager to manage OS environment in tests
1935: Teach Ninja generator about 'AR' in 'make_global_settings'
1936: First crack at adding a GYP_GENERATOR for determining various things
1937: Add unittest for 'LD' in 'make_global_settings'
1938: Remove unused parameters from test code.
1939: Revise unittest for 'LD' in 'make_global_settings'
1940: Revise unittest for 'AR' in 'make_global_settings'
1941: ninja: Read 'LD'/'LD.host' from 'make_global_settings_ld'.
1942: ninja: Read 'AR.host' from 'make_global_settings'.
1943: [gyp][Android] Implement TestGypAndroid.run_built_executable.
1944: ninja: Pass .so files outside of --start-group/--end-group.

BUG=362075,skia:2439,gyp:434
TBR=scottmg@chromium.org

Review URL: https://codereview.chromium.org/332683003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@278051 0039d316-1c4b-4281-b951-d872f2087c98

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