ninja windows: more support for VS macros

pylib/gyp/msvs_emulation.py

Index: pylib/gyp/msvs_emulation.py
diff --git a/pylib/gyp/msvs_emulation.py b/pylib/gyp/msvs_emulation.py
index 54f9d6cc6118c39492d9912d45673cc345fb7a8f..eb9e0affeb035b66494c0f7bf6384092afa54d7f 100644
--- a/pylib/gyp/msvs_emulation.py
+++ b/pylib/gyp/msvs_emulation.py
@@ -150,8 +150,10 @@ class MsvsSettings(object):
         '$(VCInstallDir)': os.path.join(self.vs_version.Path(), 'VC'),
         '$(OutDir)\\': base_to_build + '\\' if base_to_build else '',
         '$(IntDir)': '$!INTERMEDIATE_DIR',
+        '$(InputPath)': '${source}',
         '$(InputName)': '${root}',
         '$(ProjectName)': self.spec['target_name'],
+        '$(PlatformName)': 'Win32', # TODO(scottmg): Support for x64 toolchain.

[Nico, 2012/04/30 23:33:27]

I need to do this for mac too. Maybe we should talk about this.

[scottmg, 2012/04/30 23:42:27]

Sure, I think it's a long way off before Chromium will be able to ship x64
Windows, but maybe we'll want to at least have it available soon.

     }
     # Chromium uses DXSDK_DIR in include/lib paths, but it may or may not be
     # set. This happens when the SDK is sync'd via src-internal, rather than