Support for Swift language and Clang modules for ninja generator.

test/mac/swift/MySwiftClass.swift

Index: test/mac/swift/MySwiftClass.swift
diff --git a/test/mac/swift/MySwiftClass.swift b/test/mac/swift/MySwiftClass.swift
new file mode 100644
index 0000000000000000000000000000000000000000..6229a9e97f62362a6df52e5f3e9905f4c5f46afc
--- /dev/null
+++ b/test/mac/swift/MySwiftClass.swift
@@ -0,0 +1,11 @@
+import Foundation
+
+public class MySwiftClass : NSObject {
+  public override init() {
+    objcField = MyObjcClass()
+    swiftField = MySecondSwiftClass()
+  }
+  public var intField: Int = 0
+  var objcField: MyObjcClass
+  var swiftField: MySecondSwiftClass
+}