Add slice information to DownloadDestinationObserver::DestinationUpdate().

content/browser/download/download_destination_observer.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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_DESTINATION_OBSERVER_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_DESTINATION_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "content/public/browser/download_interrupt_reasons.h"
+#include "content/public/browser/download_item.h"
 #include "crypto/secure_hash.h"
 
 namespace content {
 
 // Class that receives asynchronous events from a DownloadDestination about
 // downloading progress and completion.  These should report status when the
 // data arrives at its final location; i.e. DestinationUpdate should be
 // called after the destination is finished with whatever operation it
 // is doing on the data described by |bytes_so_far| and DestinationCompleted
 // should only be called once that is true for all data.
 //
 // All methods are invoked on the UI thread.
 //
 // Note that this interface does not deal with cross-thread lifetime issues.
 class DownloadDestinationObserver {
  public:
-  virtual void DestinationUpdate(int64_t bytes_so_far,
-                                 int64_t bytes_per_sec) = 0;
+  virtual void DestinationUpdate(
+      int64_t bytes_so_far,
+      int64_t bytes_per_sec,
+      const std::vector<DownloadItem::ReceivedSlice>& received_slices) = 0;

[xingliu, 2017/02/28 22:36:00]

This is called every 0.5 second, is received_slices only used for update the
history db?

[qinmin, 2017/02/28 22:38:21]

yes, we need to keep the history db up-to-date.

 
   virtual void DestinationError(
       DownloadInterruptReason reason,
       int64_t bytes_so_far,
       std::unique_ptr<crypto::SecureHash> hash_state) = 0;
 
   virtual void DestinationCompleted(
       int64_t total_bytes,
       std::unique_ptr<crypto::SecureHash> hash_state) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_DESTINATION_OBSERVER_H_