Implement UMA and internal data structure for tracking EWOULDBLOCK.

content/browser/renderer_host/p2p/socket_host.h

Index: content/browser/renderer_host/p2p/socket_host.h
diff --git a/content/browser/renderer_host/p2p/socket_host.h b/content/browser/renderer_host/p2p/socket_host.h
index 8a12898b35b5efeb8ca63284ec9b3fc0da2349b9..ad1ff652a3465955d7484684b746363ca0dd3858 100644
--- a/content/browser/renderer_host/p2p/socket_host.h
+++ b/content/browser/renderer_host/p2p/socket_host.h
@@ -91,6 +91,9 @@ class CONTENT_EXPORT P2PSocketHost {
  protected:
   friend class P2PSocketHostTcpTestBase;
 
+  // This should match suffix IPProtocolType defined in histograms.xml.
+  enum ProtocolType { UNKNOWN = 0, UDP = 0x1, TCP = 0x2 };
+
   // TODO(mallinath) - Remove this below enum and use one defined in
   // libjingle/souce/talk/p2p/base/stun.h
   enum StunMessageType {
@@ -151,6 +154,9 @@ class CONTENT_EXPORT P2PSocketHost {
 
   base::WeakPtrFactory<P2PSocketHost> weak_ptr_factory_;
 
+  uint32 send_queue_length_max_;
+  ProtocolType protocol_type_;
+
   DISALLOW_COPY_AND_ASSIGN(P2PSocketHost);
 };