Setup the error delegate for the quota database so we get error histograms.

webkit/quota/quota_database.cc

Index: webkit/quota/quota_database.cc
===================================================================
--- webkit/quota/quota_database.cc	(revision 107665)
+++ webkit/quota/quota_database.cc	(working copy)
@@ -35,6 +35,10 @@
   static const char* name() { return "Sqlite.Quota.Error"; }
 };
 
+sql::ErrorDelegate* GetErrorHandlerForQuotaDb() {
+  return new sql::DiagnosticErrorDelegate<HistogramUniquifier>();
+}
+
 bool PrepareCachedStatement(
     sql::Connection* db, const sql::StatementID& id,
     const char* sql, sql::Statement* statement) {
@@ -477,6 +481,8 @@
   db_.reset(new sql::Connection);
   meta_table_.reset(new sql::MetaTable);
 
+  db_->set_error_delegate(GetErrorHandlerForQuotaDb());
+
   bool opened = false;
   if (in_memory_only) {
     opened = db_->OpenInMemory();