Additional platforms support for _api_features.json.

BUG=267667

Review URL: https://codereview.chromium.org/27019008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228748 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228748
roll gyp 1750:1758

1751: xcode: Mark .dart files as source code.
1752: xcode: Mark .gyp and .gypi files as source code.
1753: Process all input files in parallel in --parallel mode.
1754: ninja/mac: Add iOS fields to ExtraPlistItems for ninja builds.
1755: Remove generator_handles_variants
1756: ninja/mac: Support iOS codesign for ninja builds.
1757: Remove unused generator_wants_absolute_build_file_paths.
1758: Adds the ability to skip includes.

BUG=none
R=scottmg@chromium.org
TBR=scottmg

Review URL: https://codereview.chromium.org/27383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228749 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228750 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228749
SVN changes up to revision 228750