[NOT FOR REVIEW] Instrument net/ with trace events.

net/socket/socket_posix.cc

 // Copyright 2014 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 "net/socket/socket_posix.h"
 
 #include <errno.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 #include "net/base/io_buffer.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
 #include "net/base/sockaddr_storage.h"
 
+#include "base/trace_event/trace_event.h"
+
 namespace net {
 
 namespace {
 
 int MapAcceptError(int os_error) {
   switch (os_error) {
     // If the client aborts the connection before the server calls accept,
     // POSIX specifies accept should fail with ECONNABORTED. The server can
     // ignore the error and just call accept again, so we map the error to
     // ERR_IO_PENDING. See UNIX Network Programming, Vol. 1, 3rd Ed., Sec.
@@ skipping 310 matching lines @@
       PLOG(ERROR) << "close() returned an error, errno=" << errno;
     socket_fd_ = kInvalidSocket;
   }
 }
 
 void SocketPosix::DetachFromThread() {
   thread_checker_.DetachFromThread();
 }
 
 void SocketPosix::OnFileCanReadWithoutBlocking(int fd) {
+  TRACE_EVENT0("net", "net::SocketPosix::OnFileCanReadWithoutBlocking");
   DCHECK(!accept_callback_.is_null() || !read_callback_.is_null());
   if (!accept_callback_.is_null()) {
     AcceptCompleted();
   } else {  // !read_callback_.is_null()
     ReadCompleted();
   }
 }
 
 void SocketPosix::OnFileCanWriteWithoutBlocking(int fd) {
   DCHECK(!write_callback_.is_null());
@@ skipping 117 matching lines @@
     write_buf_ = NULL;
     write_buf_len_ = 0;
     write_callback_.Reset();
   }
 
   waiting_connect_ = false;
   peer_address_.reset();
 }
 
 }  // namespace net