Preliminary work on resuming downloads whose connections have expired.

chrome/browser/history/download_database.cc

Index: chrome/browser/history/download_database.cc
diff --git a/chrome/browser/history/download_database.cc b/chrome/browser/history/download_database.cc
index f101e395f2169176bf891cdc9eefe6d0509d8848..16faac84e84f6cdeaac2f9b946a50c9d370b4d3f 100644
--- a/chrome/browser/history/download_database.cc
+++ b/chrome/browser/history/download_database.cc
@@ -146,10 +146,21 @@ bool DownloadDatabase::CleanUpInProgressEntries() {
 }
 
 int64 DownloadDatabase::CreateDownload(const DownloadCreateInfo& info) {
-  sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
-      "INSERT INTO downloads "
-      "(full_path, url, start_time, received_bytes, total_bytes, state) "
-      "VALUES (?, ?, ?, ?, ?, ?)"));
+  // If the database contains the 'last_modified' field, then set it to blank.
+  bool has_last_mod = GetDB().DoesColumnExist("downloads", "last_modified");
+  sql::Statement statement;
+  if (has_last_mod) {
+    statement.Assign(GetDB().GetCachedStatement(SQL_FROM_HERE,
+        "INSERT INTO downloads "
+        "(full_path, url, start_time, received_bytes, total_bytes, state, "
+        "last_modified) "
+        "VALUES (?, ?, ?, ?, ?, ?, ?)"));
+  } else {
+    statement.Assign(GetDB().GetCachedStatement(SQL_FROM_HERE,
+        "INSERT INTO downloads "
+        "(full_path, url, start_time, received_bytes, total_bytes, state) "
+        "VALUES (?, ?, ?, ?, ?, ?)"));
+  }
   if (!statement)
     return 0;
 
@@ -159,6 +170,8 @@ int64 DownloadDatabase::CreateDownload(const DownloadCreateInfo& info) {
   statement.BindInt64(3, info.received_bytes);
   statement.BindInt64(4, info.total_bytes);
   statement.BindInt(5, info.state);
+  if (has_last_mod)
+    statement.BindString(6, "");
 
   if (statement.Run())
     return GetDB().GetLastInsertRowId();