Integrate ninja build with Visual Studio

test/msvs/external_builder/msbuild_action.py

Index: test/msvs/external_builder/msbuild_action.py
diff --git a/test/self-dependency/self_dependency.gyp b/test/msvs/external_builder/msbuild_action.py
similarity index 55%
copy from test/self-dependency/self_dependency.gyp
copy to test/msvs/external_builder/msbuild_action.py
index 0ca76c669b6a686bf686c5b9a4be5e9ebc2b2c41..632d786922fd52851f7253abd644a6279084d3ed 100644
--- a/test/self-dependency/self_dependency.gyp
+++ b/test/msvs/external_builder/msbuild_action.py
@@ -2,14 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-{
-  'includes': [
-    'common.gypi',
-  ],
-  'targets': [
-    {
-      'target_name': 'a',
-      'type': 'none',
-    },
-  ],
-}
+import sys
+
+with open('msbuild_action.out', 'w') as f:
+  f.write(' '.join(sys.argv))
+