First pass at adding http/backend cache to NetLog

net/disk_cache/entry_impl.h

Index: net/disk_cache/entry_impl.h
===================================================================
--- net/disk_cache/entry_impl.h	(revision 68857)
+++ net/disk_cache/entry_impl.h	(working copy)
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "base/scoped_ptr.h"
+#include "net/base/net_log.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/storage_block.h"
 #include "net/disk_cache/storage_block-inl.h"
@@ -129,12 +130,27 @@
   // Generates a histogram for the time spent working on this operation.
   void ReportIOTime(Operation op, const base::TimeTicks& start);
 
+  // Logs a begin event and enables logging for the EntryImpl.  Will also cause
+  // an end event to be logged on destruction.  The EntryImpl must have its key
+  // initialized before this is called.  |created| is true if the Entry was
+  // created.
+  void BeginLogging(net::NetLog* net_log, bool created);
+
+  const net::BoundNetLog& net_log() const;
+
  private:
   enum {
      kNumStreams = 3
   };
   class UserBuffer;
 
+  // Do all the work for ReadDataImpl and WriteDataImpl.  Implemented as
+  // separate functions to make logging of results simpler.
+  int InternalReadData(int index, int offset, net::IOBuffer* buf,
+                       int buf_len, CompletionCallback* callback);
+  int InternalWriteData(int index, int offset, net::IOBuffer* buf, int buf_len,
+                        CompletionCallback* callback, bool truncate);
+
   ~EntryImpl();
 
   // Initializes the storage for an internal or external data block.
@@ -220,6 +236,8 @@
   bool read_only_;            // True if not yet writing.
   scoped_ptr<SparseControl> sparse_;  // Support for sparse entries.
 
+  net::BoundNetLog net_log_;
+
   DISALLOW_COPY_AND_ASSIGN(EntryImpl);
 };