Fraction class prototype and test (not to be committed).

runtime/vm/object_store.cc

Index: runtime/vm/object_store.cc
diff --git a/runtime/vm/object_store.cc b/runtime/vm/object_store.cc
index 5528afd0487c9a0963997af94b07d0e7b80f73bf..f3be42b4e0ed46a427e567dc9c3b1fe95c6cb793 100644
--- a/runtime/vm/object_store.cc
+++ b/runtime/vm/object_store.cc
@@ -31,6 +31,7 @@ ObjectStore::ObjectStore()
     bigint_class_(Class::null()),
     double_class_(Class::null()),
     double_type_(Type::null()),
+    fraction_class_(Class::null()),
     float32x4_type_(Type::null()),
     int32x4_type_(Type::null()),
     float64x2_type_(Type::null()),
@@ -55,6 +56,7 @@ ObjectStore::ObjectStore()
     float64x2_class_(Class::null()),
     error_class_(Class::null()),
     weak_property_class_(Class::null()),
+    byte_buffer_class_(Class::null()),
     symbol_table_(Array::null()),
     canonical_types_(Array::null()),
     canonical_type_arguments_(Array::null()),
@@ -164,6 +166,7 @@ RawError* ObjectStore::PreallocateObjects() {
   result = DartLibraryCalls::InstanceCreate(library,
                                             Symbols::StackOverflowError(),
                                             Symbols::Dot(),
+                                            false,  // Not a factory.
                                             Object::empty_array());
   if (result.IsError()) {
     return Error::Cast(result).raw();
@@ -173,6 +176,7 @@ RawError* ObjectStore::PreallocateObjects() {
   result = DartLibraryCalls::InstanceCreate(library,
                                             Symbols::OutOfMemoryError(),
                                             Symbols::Dot(),
+                                            false,  // Not a factory.
                                             Object::empty_array());
   if (result.IsError()) {
     return Error::Cast(result).raw();