Improve performance of proxy resolver by tracing DNS dependencies.

net/base/capturing_net_log.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 NET_BASE_CAPTURING_NET_LOG_H_
 #define NET_BASE_CAPTURING_NET_LOG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 36 matching lines @@
     // Attempt to retrieve an value of the specified type with the given name
     // from |params|.  Returns true on success, false on failure.  Does not
     // modify |value| on failure.
     bool GetStringValue(const std::string& name, std::string* value) const;
     bool GetIntegerValue(const std::string& name, int* value) const;
 
     // Same as GetIntegerValue, but returns the error code associated with a
     // log entry.
     bool GetNetErrorCode(int* value) const;
 
+    // Returns the parameters as a JSON string, or empty string if there are no
+    // parameters.
+    std::string GetParamsJson() const;
+
     EventType type;
     base::TimeTicks time;
     Source source;
     EventPhase phase;
     scoped_ptr<base::DictionaryValue> params;
   };
 
   // Ordered set of entries that were logged.
   typedef std::vector<CapturedEntry> CapturedEntryList;
 
@@ skipping 61 matching lines @@
  private:
   CapturingNetLog capturing_net_log_;
   const BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(CapturingBoundNetLog);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_CAPTURING_NET_LOG_H_