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 147715)
+++ sql/statement.cc	(working copy)
@@ -48,6 +48,7 @@
 }
 
 bool Statement::Run() {
+  ref_->AssertIOAllowed();
   if (!CheckValid())
     return false;
 
@@ -55,6 +56,7 @@
 }
 
 bool Statement::Step() {
+  ref_->AssertIOAllowed();
   if (!CheckValid())
     return false;
 
@@ -62,6 +64,7 @@
 }
 
 void Statement::Reset(bool clear_bound_vars) {
+  ref_->AssertIOAllowed();
   if (is_valid()) {
     // We don't call CheckError() here because sqlite3_reset() returns
     // the last error that Step() caused thereby generating a second