Generates the DTLS identity in browser process and returns it to render process.

content/common/media/dtls_identity_messages.h

Index: content/common/media/dtls_identity_messages.h
diff --git a/content/common/media/dtls_identity_messages.h b/content/common/media/dtls_identity_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..962e2e67bf96afe842c2cc1669248d832c5db498
--- /dev/null
+++ b/content/common/media/dtls_identity_messages.h
@@ -0,0 +1,24 @@
+// Copyright (c) 2013 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.
+
+// IPC messages for requesting DTLS identity.
+// Multiply-included message file, hence no include guard.
+
+#include "googleurl/src/gurl.h"
+#include "ipc/ipc_message_macros.h"
+
+#define IPC_MESSAGE_START DtlsIdentityMsgStart
+
+// Messages sent from the renderer to the browser.
+// Request a DTLS identity.
+IPC_MESSAGE_CONTROL3(DTLSIdentityMsg_GetOrGenerate,

[jam, 2013/06/06 16:22:32]

nit: DTLSIdentityHostMsg. we use that convention to differentiate messages
to/from the browser when the browser has a class called "Host"

+                     GURL /* origin */,
+                     std::string /* identity_name */,
+                     std::string /* common_name */)
+
+// Messages sent from the browser to the renderer.
+// Return a DTLS identity.
+IPC_MESSAGE_CONTROL2(DTLSIdentityMsg_IdentityReady,
+                     std::string /* certificate */,
+                     std::string /* private_key */)