Add the copresence DirectiveHandler.

components/copresence/common/copresence_constants.h

Index: components/copresence/common/copresence_constants.h
diff --git a/components/copresence/common/copresence_constants.h b/components/copresence/common/copresence_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..fae27e43a76da60fbe29da3c698303b6e6f83c85
--- /dev/null
+++ b/components/copresence/common/copresence_constants.h
@@ -0,0 +1,21 @@
+// Copyright 2014 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.
+
+#ifndef COMPONENTS_COPRESENCE_COMMON_COPRESENCE_CONSTANTS_
+#define COMPONENTS_COPRESENCE_COMMON_COPRESENCE_CONSTANTS_
+
+#include "media/base/channel_layout.h"
+
+namespace copresence {
+
+extern const int kDefaultRepetitions;

[Daniel Erat, 2014/07/25 23:09:00]

nit: add a brief comment documenting what each of these is used for (or better,
make them be public static members of the classes that they're most closely
associated with if possible)

[rkc, 2014/07/28 21:01:59]

We eventually want to make these values configurable, in which case I'll remove
them from here.
Added a TODO and detailed comments for each field.

+extern const float kDefaultSampleRate;
+extern const int kDefaultBitsPerSample;
+extern const float kDefaultCarrierFrequency;
+extern const int kDefaultChannels;
+extern const media::ChannelLayout kDefaultChannelLayout;
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_COMMON_COPRESENCE_CONSTANTS_