IPC: Add more debug info.

ipc/ipc_channel_win.h

 // Copyright (c) 2012 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 IPC_IPC_CHANNEL_WIN_H_
 #define IPC_IPC_CHANNEL_WIN_H_
 
 #include "ipc/ipc_channel.h"
 
 #include <queue>
@@ skipping 80 matching lines @@
   // problems.  TODO(darin): make this unnecessary
   bool processing_incoming_;
 
   // Determines if we should validate a client's secret on connection.
   bool validate_client_;
 
   // True if there is a write in progress. TODO(rvargas): remove this.
   bool writing_;
 
   // Tracks the lifetime of this object, for debugging purposes.
-  int32 debug_flags_;
+  uint32 debug_flags_;
+
+  // OS result for the current write. TODO(rvargas): remove this.
+  uint32 write_error_;
+
+  // OS result for a previous failed write. TODO(rvargas): remove this.
+  uint32 last_write_error_;
+
+  // Size of the current write. TODO(rvargas): remove this.
+  uint32 write_size_;
 
   // This is a unique per-channel value used to authenticate the client end of
   // a connection. If the value is non-zero, the client passes it in the hello
   // and the host validates. (We don't send the zero value fto preserve IPC
   // compatability with existing clients that don't validate the channel.)
   int32 client_secret_;
 
   scoped_ptr<base::ThreadChecker> thread_check_;
   base::WeakPtrFactory<ChannelWin> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelWin);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_WIN_H_