Implement offline mode behind a flag

net/http/http_cache_transaction.cc

 // 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.
 
 #include "net/http/http_cache_transaction.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_POSIX)
 #include <unistd.h>
@@ skipping 866 matching lines @@
     // If we have an authentication response, we are exposed to weird things
     // hapenning if the user cancels the authentication before we receive
     // the new response.
     UpdateTransactionPattern(PATTERN_NOT_COVERED);
     response_ = HttpResponseInfo();
     network_trans_.reset();
     new_response_ = NULL;
     next_state_ = STATE_SEND_REQUEST;
     return OK;
   }
+
   if (handling_206_ && mode_ == READ_WRITE && !truncated_ && !is_sparse_) {
     // We have stored the full entry, but it changed and the server is
     // sending a range. We have to delete the old entry.
     UpdateTransactionPattern(PATTERN_NOT_COVERED);
     DoneWritingToEntry(false);
   }
   if (new_response_->headers->response_code() == 416 &&
       (request_->method == "GET" || request_->method == "POST")) {
     DCHECK_EQ(NONE, mode_);
     response_ = *new_response_;
@@ skipping 1649 matching lines @@
 }
 
 int HttpCache::Transaction::ResetCacheIOStart(int return_value) {
   DCHECK(cache_io_start_.is_null());
   if (return_value == ERR_IO_PENDING)
     cache_io_start_ = base::TimeTicks::Now();
   return return_value;
 }
 
 }  // namespace net