AU: Push seeks in http fetching to the progress percentage.

multi_http_fetcher.h

 // Copyright (c) 2010 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_MULTI_HTTP_FETCHER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_MULTI_HTTP_FETCHER_H__
 
 #include <tr1/memory>
 #include <utility>
 #include <vector>
@@ skipping 104 matching lines @@
   }
 
   void StartTransfer() {
     if (current_index_ >= ranges_.size()) {
       return;
     }
     LOG(INFO) << "Starting a transfer @" << ranges_[current_index_].first << "("
               << ranges_[current_index_].second << ")";
     bytes_received_this_fetcher_ = 0;
     fetchers_[current_index_]->SetOffset(ranges_[current_index_].first);
+    if (delegate_)
+      delegate_->SeekToOffset(ranges_[current_index_].first);
     fetchers_[current_index_]->BeginTransfer(url_);
   }
 
   void ReceivedBytes(HttpFetcher* fetcher,
                      const char* bytes,
                      int length) {
     if (current_index_ >= ranges_.size())
       return;
     if (fetcher != fetchers_[current_index_].get()) {
       LOG(WARNING) << "Received bytes from invalid fetcher";
       return;
     }
     off_t next_size = length;
     if (ranges_[current_index_].second >= 0) {
       next_size = std::min(next_size,
                            ranges_[current_index_].second -
                            bytes_received_this_fetcher_);
     }
     LOG_IF(WARNING, next_size <= 0) << "Asked to write length <= 0";
-    if (delegate_)
+    if (delegate_) {
       delegate_->ReceivedBytes(this, bytes, next_size);
+    }
     bytes_received_this_fetcher_ += length;
     if (ranges_[current_index_].second >= 0 &&
         bytes_received_this_fetcher_ >= ranges_[current_index_].second) {
       fetchers_[current_index_]->TerminateTransfer();
       current_index_++;
       if (current_index_ == ranges_.size()) {
         SendTransferComplete(fetchers_[current_index_ - 1].get(), true);
       } else {
         StartTransfer();
       }
@@ skipping 38 matching lines @@
   RangesVect::size_type current_index_;  // index into ranges_, fetchers_
   off_t bytes_received_this_fetcher_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MultiHttpFetcher);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_MULTI_HTTP_FETCHER_H__