Add Ninja support for MSVS $(TargetExt), $(TargetFileName) and $(TargetPath) macros.

test/win/gyptest-macro-targetext.py

Index: test/win/gyptest-macro-targetext.py
diff --git a/test/win/gyptest-macro-targetext.py b/test/win/gyptest-macro-targetext.py
new file mode 100644
index 0000000000000000000000000000000000000000..450710d6310301886fac78009d3a73af3a3d05f9
--- /dev/null
+++ b/test/win/gyptest-macro-targetext.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2014 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Make sure macro expansion of $(TargetExt) is handled.
+"""
+
+import TestGyp
+
+import sys
+
+if sys.platform == 'win32':
+  test = TestGyp.TestGyp(formats=['msvs', 'ninja'])
+
+  CHDIR = 'vs-macros'
+  test.run_gyp('targetext.gyp', chdir=CHDIR)
+  test.build('targetext.gyp', test.ALL, chdir=CHDIR)
+  test.built_file_must_exist('executable.exe', chdir=CHDIR)
+  test.built_file_must_exist('loadable_module.dll', chdir=CHDIR)
+  test.built_file_must_exist('shared_library.dll', chdir=CHDIR)
+  test.built_file_must_exist('static_library.lib', chdir=CHDIR)
+  test.built_file_must_exist('product_extension.library', chdir=CHDIR)
+  test.pass_test()