Adding histograms showing fraction of page load times

net/http/http_cache_transaction.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.
 
 // This file declares HttpCache::Transaction, a private class of HttpCache so
 // it should only be included by http_cache.cc
 
 #ifndef NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 #define NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 #pragma once
 
 #include <string>
 
 #include "base/time.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_log.h"
 #include "net/http/http_cache.h"
 #include "net/http/http_response_info.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_transaction.h"
 
 namespace net {
 
 class PartialData;
 struct HttpRequestInfo;
+class HttpTransactionDelegate;
 
 // This is the transaction that is returned by the HttpCache transaction
 // factory.
 class HttpCache::Transaction : public HttpTransaction {
  public:
   // The transaction has the following modes, which apply to how it may access
   // its cache entry.
   //
   //  o If the mode of the transaction is NONE, then it is in "pass through"
   //    mode and all methods just forward to the inner network transaction.
@@ skipping 14 matching lines @@
   enum Mode {
     NONE            = 0,
     READ_META       = 1 << 0,
     READ_DATA       = 1 << 1,
     READ            = READ_META | READ_DATA,
     WRITE           = 1 << 2,
     READ_WRITE      = READ | WRITE,
     UPDATE          = READ_META | WRITE,  // READ_WRITE & ~READ_DATA
   };
 
-  explicit Transaction(HttpCache* cache);
+  explicit Transaction(HttpCache* cache, HttpTransactionDelegate* delegate);
   virtual ~Transaction();
 
   Mode mode() const { return mode_; }
 
   const std::string& key() const { return cache_key_; }
 
   // Writes |buf_len| bytes of meta-data from the provided buffer |buf|. to the
   // HTTP cache entry that backs this transaction (if any).
   // Returns the number of bytes actually written, or a net error code. If the
   // operation cannot complete immediately, returns ERR_IO_PENDING, grabs a
@@ skipping 257 matching lines @@
   int DoPartialCacheReadCompleted(int result);
 
   // Returns true if we should bother attempting to resume this request if it
   // is aborted while in progress. If |has_data| is true, the size of the stored
   // data is considered for the result.
   bool CanResume(bool has_data);
 
   // Called to signal completion of asynchronous IO.
   void OnIOComplete(int result);
 
+  void ReportCacheActionStart();
+  void ReportCacheActionFinish();
+
   State next_state_;
   const HttpRequestInfo* request_;
   BoundNetLog net_log_;
   scoped_ptr<HttpRequestInfo> custom_request_;
   HttpRequestHeaders request_headers_copy_;
   // If extra_headers specified a "if-modified-since" or "if-none-match",
   // |external_validation_| contains the value of those headers.
   ValidationHeaders external_validation_;
   base::WeakPtr<HttpCache> cache_;
   HttpCache::ActiveEntry* entry_;
@@ skipping 17 matching lines @@
   bool done_reading_;
   scoped_refptr<IOBuffer> read_buf_;
   int io_buf_len_;
   int read_offset_;
   int effective_load_flags_;
   int write_len_;
   scoped_ptr<PartialData> partial_;  // We are dealing with range requests.
   uint64 final_upload_progress_;
   base::WeakPtrFactory<Transaction> weak_factory_;
   CompletionCallback io_callback_;
+  HttpTransactionDelegate* delegate_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_TRANSACTION_H_