Adding details to most quic connection close calls.

net/quic/quic_flow_controller.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/quic/quic_flow_controller.h"
 
 #include "base/basictypes.h"
+#include "base/strings/stringprintf.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_flags.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 
 #define ENDPOINT \
   (perspective_ == Perspective::IS_SERVER ? "Server: " : "Client: ")
 
 QuicFlowController::QuicFlowController(QuicConnection* connection,
@@ skipping 48 matching lines @@
 }
 
 void QuicFlowController::AddBytesSent(QuicByteCount bytes_sent) {
   if (bytes_sent_ + bytes_sent > send_window_offset_) {
     LOG(DFATAL) << ENDPOINT << "Stream " << id_ << " Trying to send an extra "
                 << bytes_sent << " bytes, when bytes_sent = " << bytes_sent_
                 << ", and send_window_offset_ = " << send_window_offset_;
     bytes_sent_ = send_window_offset_;
 
     // This is an error on our side, close the connection as soon as possible.
-    connection_->SendConnectionClose(QUIC_FLOW_CONTROL_SENT_TOO_MUCH_DATA);
+    connection_->SendConnectionCloseWithDetails(
+        QUIC_FLOW_CONTROL_SENT_TOO_MUCH_DATA,
+        base::StringPrintf("%lu bytes over send window offset",
+                           send_window_offset_ - (bytes_sent_ + bytes_sent))
+            .c_str());
     return;
   }
 
   bytes_sent_ += bytes_sent;
   DVLOG(1) << ENDPOINT << "Stream " << id_ << " sent: " << bytes_sent_;
 }
 
 bool QuicFlowController::FlowControlViolation() {
   if (highest_received_byte_offset_ > receive_window_offset_) {
     LOG(ERROR) << ENDPOINT << "Flow control violation on stream "
@@ skipping 155 matching lines @@
   if (receive_window_size_ != receive_window_offset_) {
     LOG(DFATAL) << "receive_window_size_:" << receive_window_size_
                 << " != receive_window_offset:" << receive_window_offset_;
     return;
   }
   receive_window_size_ = size;
   receive_window_offset_ = size;
 }
 
 }  // namespace net