Add color metadata info to VideoDecoderConfig.

media/base/hdr_metadata.cc

Index: media/base/hdr_metadata.cc
diff --git a/media/base/hdr_metadata.cc b/media/base/hdr_metadata.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e4e8d87c87bd9b12ec08437a23f3f91bf254d30f
--- /dev/null
+++ b/media/base/hdr_metadata.cc
@@ -0,0 +1,15 @@
+// Copyright 2016 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 "media/base/hdr_metadata.h"
+
+namespace media {
+
+MasteringMetadata::MasteringMetadata() {}
+MasteringMetadata::MasteringMetadata(const MasteringMetadata& rhs) = default;
+
+HDRMetadata::HDRMetadata() {}
+HDRMetadata::HDRMetadata(const HDRMetadata& rhs) = default;
+
+}  // namespace media