Downloads: Added transient flag to download item and download database

components/history/core/browser/download_row.cc

Index: components/history/core/browser/download_row.cc
diff --git a/components/history/core/browser/download_row.cc b/components/history/core/browser/download_row.cc
index fac2b5caa2e8196bf35289313d9ac9e36c00a07b..75d2c865d77b12c1ff2356f3a0f4f9b7cf0cb2fc 100644
--- a/components/history/core/browser/download_row.cc
+++ b/components/history/core/browser/download_row.cc
@@ -15,7 +15,8 @@ DownloadRow::DownloadRow()
       danger_type(DownloadDangerType::NOT_DANGEROUS),
       interrupt_reason(0),
       id(kInvalidDownloadId),
-      opened(false) {
+      opened(false),
+      visible(true) {
   // |interrupt_reason| is left undefined by this constructor as the value
   // has no meaning unless |state| is equal to kStateInterrupted.
 }
@@ -45,6 +46,7 @@ DownloadRow::DownloadRow(
     const std::string& guid,
     bool download_opened,
     base::Time last_access,
+    bool visible,
     const std::string& ext_id,
     const std::string& ext_name,
     const std::vector<DownloadSliceInfo>& download_slice_info)
@@ -72,6 +74,7 @@ DownloadRow::DownloadRow(
       guid(guid),
       opened(download_opened),
       last_access_time(last_access),
+      visible(visible),
       by_ext_id(ext_id),
       by_ext_name(ext_name),
       download_slice_info(download_slice_info) {}
@@ -94,7 +97,7 @@ bool DownloadRow::operator==(const DownloadRow& rhs) const {
          danger_type == rhs.danger_type &&
          interrupt_reason == rhs.interrupt_reason && hash == rhs.hash &&
          id == rhs.id && guid == rhs.guid && opened == rhs.opened &&
-         last_access_time == rhs.last_access_time &&
+         last_access_time == rhs.last_access_time && visible == rhs.visible &&
          by_ext_id == rhs.by_ext_id && by_ext_name == rhs.by_ext_name &&
          download_slice_info == rhs.download_slice_info;
 }