This CL adds methods to manipulate RTP header extension, particularly

content/browser/renderer_host/p2p/socket_host_test_utils.cc

Index: content/browser/renderer_host/p2p/socket_host_test_utils.cc
diff --git a/content/browser/renderer_host/p2p/socket_host_test_utils.cc b/content/browser/renderer_host/p2p/socket_host_test_utils.cc
index 67c461a6b97c64a225ee47521d1ee01f5c366f99..9c3572f204dc5fce55fc56a49b8dafa54833b53e 100644
--- a/content/browser/renderer_host/p2p/socket_host_test_utils.cc
+++ b/content/browser/renderer_host/p2p/socket_host_test_utils.cc
@@ -199,10 +199,29 @@ void CreateStunResponse(std::vector<char>* packet) {
   CreateStunPacket(packet, kStunBindingResponse);
 }
 
+
 void CreateStunError(std::vector<char>* packet) {
   CreateStunPacket(packet, kStunBindingError);
 }
 
+void CreateRtpPacket(std::vector<char>* packet) {
+ CreateRandomPacket(packet);  // Minimum length is 20 bytes.
+  *reinterpret_cast<uint8*>(&*packet->begin()) = 0x80;
+  // Extension bit not set.
+}
+
+void CreateRtpPacketWithSendtimeExtension(std::vector<char>* packet,
+                                          int extension_id) {
+ CreateRandomPacket(packet);
+  *reinterpret_cast<uint8*>(&*packet->begin()) = 0x81;
+  *reinterpret_cast<uint16*>(&*packet->begin() + kRtpHeaderSize) = 0xBEDE;

[juberti2, 2014/02/22 01:16:05]

Need to use SetBE16 to get the right endianness

+  *reinterpret_cast<uint16*>(&*packet->begin() + kRtpHeaderSize + 2) = 1;
+  *reinterpret_cast<uint8*>(&*packet->begin() + kRtpHeaderSize + 4) =
+      (extension_id << 4) + 2;
+}
+
+void CreateTurn
+
 net::IPEndPoint ParseAddress(const std::string ip_str, int port) {
   net::IPAddressNumber ip;
   EXPECT_TRUE(net::ParseIPLiteralToNumber(ip_str, &ip));