Display the proxy PAC javascript errors in the NetLog....

net/base/net_log.h

 // Copyright (c) 2010 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 NET_BASE_NET_LOG_H_
 #define NET_BASE_NET_LOG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 83 matching lines @@
 
   // Emits an event to the log stream.
   //  |type| - The type of the event.
   //  |time| - The time when the event occurred.
   //  |source| - The source that generated the event.
   //  |phase| - An optional parameter indicating whether this is the start/end
   //            of an action.
   //  |params| - Optional (may be NULL) parameters for this event.
   //             The specific subclass of EventParameters is defined
   //             by the contract for events of this |type|.
+  //             TODO(eroman): Take a scoped_refptr<> instead.
   virtual void AddEntry(EventType type,
                         const base::TimeTicks& time,
                         const Source& source,
                         EventPhase phase,
                         EventParameters* params) = 0;
 
   // Returns a unique ID which can be used as a source ID.
   virtual uint32 NextID() = 0;
 
   // Returns true if more complicated messages should be sent to the log.
@@ skipping 107 matching lines @@
   virtual Value* ToValue() const;
 
  private:
   const char* name_;
   const NetLog::Source value_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_LOG_H_