Update base/timer.h code to pass through Location from call sites.

net/curvecp/messenger.cc

Index: net/curvecp/messenger.cc
diff --git a/net/curvecp/messenger.cc b/net/curvecp/messenger.cc
index 703bc2efe11f6e3f421523f08e3379f34731a877..f1aaae09ea888cfe172ee1f659846044adc9152c 100644
--- a/net/curvecp/messenger.cc
+++ b/net/curvecp/messenger.cc
@@ -94,7 +94,8 @@ int Messenger::Write(IOBuffer* buf, int buf_len, CompletionCallback* callback) {
 
   int len = send_buffer_.write(buf->data(), buf_len);
   if (!send_timer_.IsRunning())
-    send_timer_.Start(base::TimeDelta(), this, &Messenger::OnSendTimer);
+    send_timer_.Start(base::TimeDelta(), this, &Messenger::OnSendTimer,
+                      FROM_HERE);
   if (len)
     return len;
 
@@ -183,7 +184,7 @@ void Messenger::OnSendMessageComplete(int result) {
     LOG(ERROR) << "RttTimeout is " << rtt_.rtt_timeout();
     base::TimeDelta delay =
         base::TimeDelta::FromMicroseconds(rtt_.rtt_timeout());
-    send_timeout_timer_.Start(delay, this, &Messenger::OnTimeout);
+    send_timeout_timer_.Start(delay, this, &Messenger::OnTimeout, FROM_HERE);
   }
 }
 
@@ -215,8 +216,7 @@ void Messenger::OnSendTimer() {
   // Set the next send timer.
   LOG(ERROR) << "SendRate is: " << rtt_.send_rate() << "us";
   send_timer_.Start(base::TimeDelta::FromMicroseconds(rtt_.send_rate()),
-                    this,
-                    &Messenger::OnSendTimer);
+                    this, &Messenger::OnSendTimer, FROM_HERE);
 
   // Create a block from the send_buffer.
   if (!sent_list_.is_full()) {