Implement UMA and internal data structure for tracking EWOULDBLOCK.

content/browser/renderer_host/p2p/socket_host.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_
 
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "content/common/p2p_socket_type.h"
@@ skipping 73 matching lines @@
 
   void StartRtpDump(
       bool incoming,
       bool outgoing,
       const RenderProcessHost::WebRtcRtpPacketCallback& packet_callback);
   void StopRtpDump(bool incoming, bool outgoing);
 
  protected:
   friend class P2PSocketHostTcpTestBase;
 
+  // This should match suffix IPProtocolType defined in histograms.xml.
+  enum ProtocolType { UDP = 0x1, TCP = 0x2 };
+
   // TODO(mallinath) - Remove this below enum and use one defined in
   // libjingle/souce/talk/p2p/base/stun.h
   enum StunMessageType {
     STUN_BINDING_REQUEST = 0x0001,
     STUN_BINDING_RESPONSE = 0x0101,
     STUN_BINDING_ERROR_RESPONSE = 0x0111,
     STUN_SHARED_SECRET_REQUEST = 0x0002,
     STUN_SHARED_SECRET_RESPONSE = 0x0102,
     STUN_SHARED_SECRET_ERROR_RESPONSE = 0x0112,
     STUN_ALLOCATE_REQUEST = 0x0003,
@@ skipping 14 matching lines @@
   };
 
   enum State {
     STATE_UNINITIALIZED,
     STATE_CONNECTING,
     STATE_TLS_CONNECTING,
     STATE_OPEN,
     STATE_ERROR,
   };
 
-  P2PSocketHost(IPC::Sender* message_sender, int socket_id);
+  P2PSocketHost(IPC::Sender* message_sender,
+                int socket_id,
+                ProtocolType protocol_type);
 
   // Verifies that the packet |data| has a valid STUN header. In case
   // of success stores type of the message in |type|.
   static bool GetStunPacketType(const char* data, int data_size,
                                 StunMessageType* type);
   static bool IsRequestOrResponse(StunMessageType type);
 
   // Calls |packet_dump_callback_| to record the RTP header.
   void DumpRtpPacket(const char* packet, size_t length, bool incoming);
 
   // A helper to dump the packet on the IO thread.
   void DumpRtpPacketOnIOThread(scoped_ptr<uint8[]> packet_header,
                                size_t header_length,
                                size_t packet_length,
                                bool incoming);
 
+  // Used by subclasses to track the metrics of delayed bytes and packets.
+  void IncrementDelayedPackets();
+  void IncrementTotalSentPackets();
+  void IncrementDelayedBytes(uint32 size);
+  void DecrementDelayedBytes(uint32 size);
+
   IPC::Sender* message_sender_;
   int id_;
   State state_;
   bool dump_incoming_rtp_packet_;
   bool dump_outgoing_rtp_packet_;
   RenderProcessHost::WebRtcRtpPacketCallback packet_dump_callback_;
 
   base::WeakPtrFactory<P2PSocketHost> weak_ptr_factory_;
 
+  ProtocolType protocol_type_;
+
+ private:
+  // Track total delayed packets for calculating how many packets are
+  // delayed by system at the end of call.
+  uint32 send_packets_delayed_total_;
+  uint32 send_packets_total_;
+
+  // Track the maximum of consecutive delayed bytes caused by system's
+  // EWOULDBLOCK.
+  int32 send_bytes_delayed_max_;
+  int32 send_bytes_delayed_cur_;
+
   DISALLOW_COPY_AND_ASSIGN(P2PSocketHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_P2P_SOCKET_HOST_H_