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

sql/connection.h

Index: sql/connection.h
===================================================================
--- sql/connection.h	(revision 147715)
+++ sql/connection.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -12,6 +12,7 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 #include "sql/sql_export.h"
 
@@ -320,6 +321,14 @@
   // sqlite3_open. The string can also be sqlite's special ":memory:" string.
   bool OpenInternal(const std::string& file_name);
 
+  // Check whether the current thread is allowed to make IO calls, but only
+  // if database wasn't open in memory. Function is inlined to be a no-op in
+  // official build.
+  void AssertIOAllowed() {
+    if (!in_memory_)
+      base::ThreadRestrictions::AssertIOAllowed();
+  }
+
   // Internal helper for DoesTableExist and DoesIndexExist.
   bool DoesTableOrIndexExist(const char* name, const char* type) const;
 
@@ -355,6 +364,10 @@
     // no longer be active.
     void Close();
 
+    // Check whether the current thread is allowed to make IO calls, but only
+    // if database wasn't open in memory.
+    void AssertIOAllowed() { if (connection_) connection_->AssertIOAllowed(); }
+
    private:
     friend class base::RefCounted<StatementRef>;
 
@@ -417,6 +430,10 @@
   // a rollback instead of a commit.
   bool needs_rollback_;
 
+  // True if database is open with OpenInMemory(), False if database is open
+  // with Open().
+  bool in_memory_;
+
   // This object handles errors resulting from all forms of executing sqlite
   // commands or statements. It can be null which means default handling.
   scoped_refptr<ErrorDelegate> error_delegate_;