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..b1a8bce847874e69d1cc0b19d84edcc849360ef6 100644
--- a/content/public/browser/download_url_parameters.h
+++ b/content/public/browser/download_url_parameters.h
@@ -205,6 +205,10 @@ class CONTENT_EXPORT DownloadUrlParameters {
     do_not_prompt_for_login_ = do_not_prompt;
   }
 
+  // Sets whether the download is to be treated as transient. A transient
+  // download is short-lived and is not shown in the UI.
+  void set_transient(bool transient) { transient_ = transient; }
+
   // 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
@@ -257,6 +261,7 @@ 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 +293,7 @@ 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);