Add fine grain tracing to HostResolverImpl....

net/base/host_resolver_impl.h

 // Copyright (c) 2006-2008 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_HOST_RESOLVER_IMPL_H_
 #define NET_BASE_HOST_RESOLVER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 68 matching lines @@
 
   // HostResolver methods:
   virtual int Resolve(const RequestInfo& info,
                       AddressList* addresses,
                       CompletionCallback* callback,
                       RequestHandle* out_req,
                       LoadLog* load_log);
   virtual void CancelRequest(RequestHandle req);
   virtual void AddObserver(HostResolver::Observer* observer);
   virtual void RemoveObserver(HostResolver::Observer* observer);
-  virtual HostCache* GetHostCache();
 
   // TODO(eroman): temp hack for http://crbug.com/15513
   virtual void Shutdown();
 
   virtual void SetDefaultAddressFamily(AddressFamily address_family) {
     default_address_family_ = address_family;
   }
 
+  virtual bool IsHostResolverImpl() { return true; }
+
+  // Returns the cache this resolver uses, or NULL if caching is disabled.
+  HostCache* cache() { return cache_.get(); }
+
+  // Clears the request trace log.
+  void ClearRequestsTrace();
+
+  // Starts/ends capturing requests to a trace log.
+  void EnableRequestsTracing(bool enable);
+
+  bool IsRequestsTracingEnabled() const;
+
+  // Returns a copy of the requests trace log, or NULL if there is none.
+  scoped_refptr<LoadLog> GetRequestsTrace();
+
   // Applies a set of constraints for requests that belong to the specified
   // pool. NOTE: Don't call this after requests have been already been started.
   //
   //  |pool_index| -- Specifies which pool these constraints should be applied
   //                  to.
   //  |max_outstanding_jobs| -- How many concurrent jobs are allowed for this
   //                            pool.
   //  |max_pending_requests| -- How many requests can be enqueued for this pool
   //                            before we start dropping requests. Dropped
   //                            requests fail with
   //                            ERR_HOST_RESOLVER_QUEUE_TOO_LARGE.
   void SetPoolConstraints(JobPoolIndex pool_index,
                           size_t max_outstanding_jobs,
                           size_t max_pending_requests);
 
  private:
   class Job;
   class JobPool;
   class Request;
+  class RequestsTrace;
   typedef std::vector<Request*> RequestsList;
   typedef HostCache::Key Key;
   typedef std::map<Key, scoped_refptr<Job> > JobMap;
   typedef std::vector<HostResolver::Observer*> ObserversList;
 
   // If any completion callbacks are pending when the resolver is destroyed,
   // the host resolutions are cancelled, and the completion callbacks will not
   // be called.
   virtual ~HostResolverImpl();
 
@@ skipping 72 matching lines @@
   // HostResolver gets deleted from within the callback).
   scoped_refptr<Job> cur_completing_job_;
 
   // The observers to notify when a request starts/ends.
   ObserversList observers_;
 
   // Monotonically increasing ID number to assign to the next request.
   // Observers are the only consumers of this ID number.
   int next_request_id_;
 
+  // Monotonically increasing ID number to assign to the next job.
+  // The only consumer of this ID is the requests tracing code.
+  int next_job_id_;
+
   // The procedure to use for resolving host names. This will be NULL, except
   // in the case of unit-tests which inject custom host resolving behaviors.
   scoped_refptr<HostResolverProc> resolver_proc_;
 
   // Address family to use when the request doesn't specify one.
   AddressFamily default_address_family_;
 
   // TODO(eroman): temp hack for http://crbug.com/15513
   bool shutdown_;
 
   const scoped_refptr<NetworkChangeNotifier> network_change_notifier_;
 
+  scoped_refptr<RequestsTrace> requests_trace_;
+
   DISALLOW_COPY_AND_ASSIGN(HostResolverImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_RESOLVER_IMPL_H_