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

content/browser/renderer_host/media/dtls_identity_service_host.cc

+// 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.
+
+#include "content/browser/renderer_host/media/dtls_identity_service_host.h"
+
+#include "base/bind.h"
+#include "content/browser/media/dtls_identity_store.h"
+#include "content/common/media/dtls_identity_messages.h"
+#include "content/public/browser/render_process_host.h"
+
+namespace content {
+
+DTLSIdentityServiceHost::DTLSIdentityServiceHost() {}
+
+DTLSIdentityServiceHost::~DTLSIdentityServiceHost() {}
+
+bool DTLSIdentityServiceHost::OnMessageReceived(const IPC::Message& message,
+                                                bool* message_was_ok) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(DTLSIdentityServiceHost, message, *message_was_ok)
+    IPC_MESSAGE_HANDLER(DTLSIdentityMsg_GetOrGenerate, OnGetOrGenerateIdentity)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+  return handled;
+}
+
+void DTLSIdentityServiceHost::OnGetOrGenerateIdentity(
+    const GURL& origin,
+    const std::string& identity_name,
+    const std::string& common_name) {
+  DLOG(INFO) << "Sent identity request to DTLSIdentityStore with "
+            << "origin = " << origin.spec() << ", "
+            << "identity_name = " << identity_name << ", "
+            << "common_name = " << common_name << ".";
+
+  DTLSIdentityStore::GetInstance()->GetOrGenerateIdentity(
+      origin,
+      identity_name,
+      common_name,
+      base::Bind(&DTLSIdentityServiceHost::OnComplete, this));
+}
+
+void DTLSIdentityServiceHost::OnComplete(
+    const std::string& certificate,
+    const std::string& private_key) {
+  Send(new DTLSIdentityHostMsg_IdentityReady(certificate, private_key));

[Ami GONE FROM CHROMIUM, 2013/06/06 18:28:51]

If the renderer is gone by the time this is triggered will Send() crash the
browser?
(do you need to listen for channel closure and avoid Send()ing afterwards?)

[jiayl, 2013/06/06 21:00:08]

BrowserMessageFilter::OnChannelClosing already takes care of that. If send is
called after the channel is closed, it will abort since channel_ is null.

+}
+
+}  // namespace content