DownloadManager : Create transient downloads

content/public/browser/download_url_parameters.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_PUBLIC_BROWSER_DOWNLOAD_URL_PARAMETERS_H_
 #define CONTENT_PUBLIC_BROWSER_DOWNLOAD_URL_PARAMETERS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 186 matching lines @@
     save_info_.hash_state = std::move(hash_state);
   }
 
   // If |prompt| is true, then the user will be prompted for a filename. Ignored
   // if |file_path| is non-empty.
   void set_prompt(bool prompt) { save_info_.prompt_for_save_location = prompt; }
   void set_file(base::File file) { save_info_.file = std::move(file); }
   void set_do_not_prompt_for_login(bool do_not_prompt) {
     do_not_prompt_for_login_ = do_not_prompt;
   }
+  void set_transient(bool transient) { transient_ = transient; }

[piman, 2017/04/07 20:27:58]

nit: can you add documentation for this new public API?

 
   // For downloads of blob URLs, the caller can store a BlobDataHandle in the
   // DownloadUrlParameters object so that the blob will remain valid until
   // the download starts. The BlobDataHandle will be attached to the associated
   // URLRequest.
   //
   // This is optional. If left unspecified, and the blob URL cannot be mapped to
   // a blob by the time the download request starts, then the download will
   // fail.
   void set_blob_data_handle(
@@ skipping 33 matching lines @@
     return save_info_.suggested_name;
   }
   int64_t offset() const { return save_info_.offset; }
   int64_t length() const { return save_info_.length; }
   const std::string& hash_of_partial_file() const {
     return save_info_.hash_of_partial_file;
   }
   bool prompt() const { return save_info_.prompt_for_save_location; }
   const GURL& url() const { return url_; }
   bool do_not_prompt_for_login() const { return do_not_prompt_for_login_; }
+  bool is_transient() const { return transient_; }
 
   // STATE_CHANGING: Return the BlobDataHandle.
   std::unique_ptr<storage::BlobDataHandle> GetBlobDataHandle() {
     return std::move(blob_data_handle_);
   }
 
   // STATE CHANGING: All save_info_ sub-objects will be in an indeterminate
   // state following this call.
   DownloadSaveInfo GetSaveInfo() { return std::move(save_info_); }
 
@@ skipping 11 matching lines @@
   Referrer referrer_;
   base::Optional<url::Origin> initiator_;
   std::string referrer_encoding_;
   int render_process_host_id_;
   int render_view_host_routing_id_;
   int render_frame_host_routing_id_;
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
   DownloadSaveInfo save_info_;
   GURL url_;
   bool do_not_prompt_for_login_;
+  bool transient_;
   std::unique_ptr<storage::BlobDataHandle> blob_data_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadUrlParameters);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_URL_PARAMETERS_H_