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

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278051

[Nico, 2014-06-18 00:09:12]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-06-18 00:09:59]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thakis@chromium.org/332683003/1

[scottmg, 2014-06-18 00:20:06]

go/gypbot is busted again :( but fingers lgtm'd.

[commit-bot: I haz the power, 2014-06-18 13:09:32]

Change committed as 278051