Fix P2PSocketHostTcp to handle async write correctly.

content/browser/renderer_host/p2p/socket_host_tcp_unittest.cc

 // Copyright (c) 2012 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/p2p/socket_host_tcp.h"
 
 #include <deque>
 
 #include "base/sys_byteorder.h"
 #include "content/browser/renderer_host/p2p/socket_host_test_utils.h"
@@ skipping 163 matching lines @@
   CreateRandomPacket(&packet);
   socket_host_->Send(dest_, packet);
 
   std::string expected_data;
   expected_data.append(IntToSize(packet.size()));
   expected_data.append(packet.begin(), packet.end());
 
   EXPECT_EQ(expected_data, sent_data_);
 }
 
+// Verify that asynchronous writes are handled correctly.
+TEST_F(P2PSocketHostTcpTest, AsyncWrites) {
+  MessageLoop message_loop;
+
+  socket_->set_async_write(true);
+
+  EXPECT_CALL(sender_, Send(
+      MatchMessage(static_cast<uint32>(P2PMsg_OnSendComplete::ID))))
+      .Times(2)
+      .WillRepeatedly(DoAll(DeleteArg<0>(), Return(true)));
+
+  std::vector<char> packet1;
+  CreateStunRequest(&packet1);
+  socket_host_->Send(dest_, packet1);
+
+  std::vector<char> packet2;
+  CreateStunResponse(&packet2);
+  socket_host_->Send(dest_, packet2);
+
+  message_loop.RunUntilIdle();
+
+  std::string expected_data;
+  expected_data.append(IntToSize(packet1.size()));
+  expected_data.append(packet1.begin(), packet1.end());
+  expected_data.append(IntToSize(packet2.size()));
+  expected_data.append(packet2.begin(), packet2.end());
+
+  EXPECT_EQ(expected_data, sent_data_);
+}
+
 }  // namespace content