Move InMemoryURLIndex Caching Operations to FILE Thread

chrome/browser/history/url_database.cc

Index: chrome/browser/history/url_database.cc
===================================================================
--- chrome/browser/history/url_database.cc	(revision 117518)
+++ chrome/browser/history/url_database.cc	(working copy)
@@ -261,13 +261,16 @@
 
 bool URLDatabase::InitURLEnumeratorForSignificant(URLEnumerator* enumerator) {
   DCHECK(!enumerator->initialized_);
+  sql::Connection& db(GetDB());
+  if (!db.is_open())
+    return false;

[Peter Kasting, 2012/01/14 00:12:49]

We access GetDB() directly a lot in the rest of this file.  Is there a reason
this case should differ?

[mrossetti, 2012/03/03 05:05:56]

Done.

   std::string sql("SELECT ");
   sql.append(kURLRowFields);
   sql.append(" FROM urls WHERE last_visit_time >= ? OR visit_count >= ? OR "
              "typed_count >= ?");
-  enumerator->statement_.Assign(GetDB().GetUniqueStatement(sql.c_str()));
+  enumerator->statement_.Assign(db.GetUniqueStatement(sql.c_str()));
   if (!enumerator->statement_) {
-    NOTREACHED() << GetDB().GetErrorMessage();
+    NOTREACHED() << db.GetErrorMessage();
     return false;
   }
   enumerator->statement_.BindInt64(