DownloadManager : Create transient downloads

content/public/browser/download_url_parameters.h

Index: content/public/browser/download_url_parameters.h
diff --git a/content/public/browser/download_url_parameters.h b/content/public/browser/download_url_parameters.h
index 88ff9d4d87cfcb2cd60e13241f14483525146201..eb4ebe8d0c5620c7665566da43a628d8ba52b229 100644
--- a/content/public/browser/download_url_parameters.h
+++ b/content/public/browser/download_url_parameters.h
@@ -204,6 +204,7 @@ class CONTENT_EXPORT DownloadUrlParameters {
   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
@@ -257,6 +258,7 @@ class CONTENT_EXPORT DownloadUrlParameters {
   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() {
@@ -288,6 +290,7 @@ class CONTENT_EXPORT DownloadUrlParameters {
   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);