Annotate calls to SQLite functions - they have to be executed on a thread allowing IO access.

sql/statement.cc

Index: sql/statement.cc
===================================================================
--- sql/statement.cc	(revision 142033)
+++ sql/statement.cc	(working copy)
@@ -51,6 +51,7 @@
   if (!CheckValid())
     return false;
 
+  ref_->AssertIOAllowed();
   return CheckError(sqlite3_step(ref_->stmt())) == SQLITE_DONE;
 }
 
@@ -58,6 +59,7 @@
   if (!CheckValid())
     return false;
 
+  ref_->AssertIOAllowed();
   return CheckError(sqlite3_step(ref_->stmt())) == SQLITE_ROW;
 }
 
@@ -68,6 +70,8 @@
     // spurious error callback.
     if (clear_bound_vars)
       sqlite3_clear_bindings(ref_->stmt());
+
+    ref_->AssertIOAllowed();
     sqlite3_reset(ref_->stmt());
   }