Add the copresence component.

components/copresence/public/copresence_client_delegate.h

Index: components/copresence/public/copresence_client_delegate.h
diff --git a/components/copresence/public/copresence_client_delegate.h b/components/copresence/public/copresence_client_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..374eb96561a7f40c8fcec20477c08ba4c8ecf2a3
--- /dev/null
+++ b/components/copresence/public/copresence_client_delegate.h
@@ -0,0 +1,51 @@
+// 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_PUBLIC_COPRESENCE_DELEGATE_H_
+#define COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_DELEGATE_H_
+
+#include <string>
+
+#include "base/callback_forward.h"
+#include "components/copresence/proto/rpcs.pb.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace copresence {
+
+class WhispernetClient;
+
+enum CopresenceStatus { SUCCESS, FAIL };
+
+// Callback type to send a status.
+typedef base::Callback<void(CopresenceStatus)> StatusCallback;
+
+// A delegate interface for users of Copresence.
+class CopresenceClientDelegate {
+ public:
+  // This method will be called when we have subscribed messages that need to
+  // be sent to their respective apps.
+  virtual void HandleMessages(
+      const std::string& app_id,
+      const std::string& subscription_id,
+      const std::vector<copresence::Message>& message) = 0;
+
+  virtual net::URLRequestContextGetter* GetRequestContext() const = 0;
+
+  virtual const std::string GetPlatformVersionString() const = 0;
+
+  // Methods to set and and get our device ID. This needs to be saved to
+  // persistent storage to avoid flooding the Copresence server with generate
+  // id requests.
+  virtual const std::string GetDeviceId() const = 0;
+  virtual void SaveDeviceId(const std::string& device_id) = 0;
+
+  virtual WhispernetClient* GetWhispernetClient() = 0;
+};
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_PUBLIC_COPRESENCE_DELEGATE_H_