Histogram versions and extended error codes for SQLite databases.

sql/meta_table.cc

Index: sql/meta_table.cc
diff --git a/sql/meta_table.cc b/sql/meta_table.cc
index 45f4ee09dbee49bf7677181420c79659fd9e9eb2..ded9608ca0eaff1341274171302609da52c461e3 100644
--- a/sql/meta_table.cc
+++ b/sql/meta_table.cc
@@ -52,6 +52,13 @@ bool MetaTable::Init(Connection* db, int version, int compatible_version) {
     // there, we should create an index.
     SetVersionNumber(version);
     SetCompatibleVersionNumber(compatible_version);
+  } else {
+    // At this point, the highest version is Web, at 50, then
+    // History at 25, then a tie for 6.  100 leaves some room for
+    // growth.
+    // TODO(shess): Another option would be to use |version| as the cap.
+    static size_t kSqliteVersionMax = 100;

[jar (doing other things), 2013/05/07 23:46:41]

This fits wonderfully into a UMA_HISTOGRAM_SPARSE_SLOWLY.  It will use less
memory, and never grow too old.

+    db_->AddLinearHistogram(".Version", GetVersionNumber(), kSqliteVersionMax);
   }
   return transaction.Commit();
 }