Add a GUID to base::SharedMemoryHandle.

base/memory/shared_memory_handle.cc

Index: base/memory/shared_memory_handle.cc
diff --git a/base/memory/shared_memory_handle.cc b/base/memory/shared_memory_handle.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3461cded766b4d133180112fe6e973430c618c43
--- /dev/null
+++ b/base/memory/shared_memory_handle.cc
@@ -0,0 +1,19 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/memory/shared_memory_handle.h"
+
+namespace base {
+
+SharedMemoryHandle::SharedMemoryHandle(const SharedMemoryHandle& handle) =
+    default;
+
+SharedMemoryHandle& SharedMemoryHandle::operator=(
+    const SharedMemoryHandle& handle) = default;
+
+base::UnguessableToken SharedMemoryHandle::GetGUID() const {
+  return guid_;
+}
+
+}  // namespace base