Adds the ability for save dialogs to take a default extension....

base/tuple.h

Index: base/tuple.h
===================================================================
--- base/tuple.h	(revision 5130)
+++ base/tuple.h	(working copy)
@@ -233,6 +233,51 @@
   F f;
 };
 
+template <class A, class B, class C, class D, class E, class F, class G>
+struct Tuple7 {
+public:
+  typedef A TypeA;
+  typedef B TypeB;
+  typedef C TypeC;
+  typedef D TypeD;
+  typedef E TypeE;
+  typedef F TypeF;
+  typedef G TypeG;
+  typedef Tuple7<typename TupleTraits<A>::ValueType,
+    typename TupleTraits<B>::ValueType,
+    typename TupleTraits<C>::ValueType,
+    typename TupleTraits<D>::ValueType,
+    typename TupleTraits<E>::ValueType,
+    typename TupleTraits<F>::ValueType,
+    typename TupleTraits<G>::ValueType> ValueTuple;
+  typedef Tuple7<typename TupleTraits<A>::RefType,
+    typename TupleTraits<B>::RefType,
+    typename TupleTraits<C>::RefType,
+    typename TupleTraits<D>::RefType,
+    typename TupleTraits<E>::RefType,
+    typename TupleTraits<F>::RefType,
+    typename TupleTraits<G>::RefType> RefTuple;
+
+  Tuple7() {}
+  Tuple7(typename TupleTraits<A>::ParamType a,
+    typename TupleTraits<B>::ParamType b,
+    typename TupleTraits<C>::ParamType c,
+    typename TupleTraits<D>::ParamType d,
+    typename TupleTraits<E>::ParamType e,
+    typename TupleTraits<F>::ParamType f,
+    typename TupleTraits<G>::ParamType g)
+    : a(a), b(b), c(c), d(d), e(e), f(f), g(g) {
+  }
+
+  A a;
+  B b;
+  C c;
+  D d;
+  E e;
+  F f;
+  G g;
+};
+
 // Tuple creators -------------------------------------------------------------
 //
 // Helper functions for constructing tuples while inferring the template
@@ -275,6 +320,13 @@
   return Tuple6<A, B, C, D, E, F>(a, b, c, d, e, f);
 }
 
+template <class A, class B, class C, class D, class E, class F, class G>
+inline Tuple7<A, B, C, D, E, F, G> MakeTuple(const A& a, const B& b, const C& c,
+                                             const D& d, const E& e, const F& f,
+                                             const G& g) {
+  return Tuple7<A, B, C, D, E, F, G>(a, b, c, d, e, f, g);
+}
+
 // The following set of helpers make what Boost refers to as "Tiers" - a tuple
 // of references.
 
@@ -309,6 +361,12 @@
   return Tuple6<A&, B&, C&, D&, E&, F&>(a, b, c, d, e, f);
 }
 
+template <class A, class B, class C, class D, class E, class F, class G>
+inline Tuple7<A&, B&, C&, D&, E&, F&, G&> MakeRefTuple(A& a, B& b, C& c, D& d,
+                                                       E& e, F& f, G& g) {
+  return Tuple7<A&, B&, C&, D&, E&, F&, G&>(a, b, c, d, e, f, g);
+}
+
 // Dispatchers ----------------------------------------------------------------
 //
 // Helper functions that call the given method on an object, with the unpacked
@@ -365,6 +423,13 @@
   (obj->*method)(arg.a, arg.b, arg.c, arg.d, arg.e, arg.f);
 }
 
+template<class ObjT, class Method, class A, class B, class C, class D, class E,
+         class F, class G>
+inline void DispatchToMethod(ObjT* obj, Method method,
+                             const Tuple7<A, B, C, D, E, F, G>& arg) {
+  (obj->*method)(arg.a, arg.b, arg.c, arg.d, arg.e, arg.f, arg.g);
+}
+
 // Static Dispatchers with no out params.
 
 template <class Function>