First pass at adding http/backend cache to NetLog

chrome/browser/net/passive_log_collector.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 CHROME_BROWSER_NET_PASSIVE_LOG_COLLECTOR_H_
 #define CHROME_BROWSER_NET_PASSIVE_LOG_COLLECTOR_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 286 matching lines @@
     DNSJobTracker();
 
    protected:
     virtual Action DoAddEntry(const ChromeNetLog::Entry& entry,
                               SourceInfo* out_info);
 
    private:
     DISALLOW_COPY_AND_ASSIGN(DNSJobTracker);
   };
 
+  // Tracks the log entries for the last seen SOURCE_DISK_CACHE_ENTRY.
+  class DiskCacheEntryTracker : public SourceTracker {
+   public:
+    static const size_t kMaxNumSources;
+    static const size_t kMaxGraveyardSize;
+
+    DiskCacheEntryTracker();
+
+   protected:
+    virtual Action DoAddEntry(const ChromeNetLog::Entry& entry,
+                              SourceInfo* out_info);
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(DiskCacheEntryTracker);
+  };
+
   PassiveLogCollector();
   ~PassiveLogCollector();
 
   // ThreadSafeObserver implementation:
   virtual void OnAddEntry(net::NetLog::EventType type,
                           const base::TimeTicks& time,
                           const net::NetLog::Source& source,
                           net::NetLog::EventPhase phase,
                           net::NetLog::EventParameters* params);
 
@@ skipping 16 matching lines @@
 
   GlobalSourceTracker global_source_tracker_;
   ConnectJobTracker connect_job_tracker_;
   SocketTracker socket_tracker_;
   RequestTracker url_request_tracker_;
   RequestTracker socket_stream_tracker_;
   InitProxyResolverTracker init_proxy_resolver_tracker_;
   SpdySessionTracker spdy_session_tracker_;
   DNSRequestTracker dns_request_tracker_;
   DNSJobTracker dns_job_tracker_;
+  DiskCacheEntryTracker disk_cache_entry_tracker_;
 
   // This array maps each NetLog::SourceType to one of the tracker instances
   // defined above. Use of this array avoid duplicating the list of trackers
   // elsewhere.
   SourceTrackerInterface* trackers_[net::NetLog::SOURCE_COUNT];
 
   // The count of how many events have flowed through this log. Used to set the
   // "order" field on captured events.
   uint32 num_events_seen_;
 
   DISALLOW_COPY_AND_ASSIGN(PassiveLogCollector);
 };
 
 #endif  // CHROME_BROWSER_NET_PASSIVE_LOG_COLLECTOR_H_