Downloads: Added transient flag to download item and download database

content/browser/download/download_item_impl.cc

Index: content/browser/download/download_item_impl.cc
diff --git a/content/browser/download/download_item_impl.cc b/content/browser/download/download_item_impl.cc
index cbc8cbe5dd32a6b6d6a8dbd684c0fad473deb19d..3a5c323ac0bbb5ce25c918edc9580bea91bb5beb 100644
--- a/content/browser/download/download_item_impl.cc
+++ b/content/browser/download/download_item_impl.cc
@@ -149,6 +149,7 @@ DownloadItemImpl::DownloadItemImpl(
     DownloadInterruptReason interrupt_reason,
     bool opened,
     base::Time last_access_time,
+    bool transient,
     const std::vector<DownloadItem::ReceivedSlice>& received_slices,
     const net::NetLogWithSource& net_log)
     : guid_(base::ToUpperASCII(guid)),
@@ -171,6 +172,7 @@ DownloadItemImpl::DownloadItemImpl(
       delegate_(delegate),
       opened_(opened),
       last_access_time_(last_access_time),
+      transient_(transient),
       current_path_(current_path),
       received_bytes_(received_bytes),
       all_data_saved_(state == COMPLETE),
@@ -788,6 +790,10 @@ base::Time DownloadItemImpl::GetLastAccessTime() const {
   return last_access_time_;
 }
 
+bool DownloadItemImpl::IsTransient() const {
+  return transient_;
+}
+
 BrowserContext* DownloadItemImpl::GetBrowserContext() const {
   return delegate_->GetBrowserContext();
 }