[libcxx] Add <experimental/chrono>

Summary:
This patch adds <experimental/chrono> which only contains a single variable template.

See: https://rawgit.com/cplusplus/fundamentals-ts/v1/fundamentals-ts.html#time

Reviewers: jroelofs, danalbert, K-ballo, mclow.lists

Reviewed By: mclow.lists

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D7352

llvm-svn: 227860

1 files changed, 19 insertions, 0 deletions

diff --git a/libcxx/test/std/experimental/utilities/time/header.chrono.synop/includes.pass.cpp b/libcxx/test/std/experimental/utilities/time/header.chrono.synop/includes.pass.cpp
new file mode 100644
index 00000000000..f6ad37f9ee3
--- /dev/null
+++ b/libcxx/test/std/experimental/utilities/time/header.chrono.synop/includes.pass.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/chrono>
+
+#include <experimental/chrono>
+
+int main()
+{
+  // Check that <chrono> has been included.
+  std::chrono::seconds s;
+  ((void)s);
+}