Added Uint8ClampedList. COmpielr optimziations to follow in next CL.

runtime/vm/class_finalizer.cc

Index: runtime/vm/class_finalizer.cc
===================================================================
--- runtime/vm/class_finalizer.cc	(revision 15794)
+++ runtime/vm/class_finalizer.cc	(working copy)
@@ -220,6 +220,8 @@
   ASSERT(ImmutableArray::InstanceSize() == cls.instance_size());
   cls = object_store->uint8_array_class();
   ASSERT(Uint8Array::InstanceSize() == cls.instance_size());
+  cls = object_store->uint8_clamped_array_class();
+  ASSERT(Uint8ClampedArray::InstanceSize() == cls.instance_size());
   cls = object_store->int16_array_class();
   ASSERT(Int16Array::InstanceSize() == cls.instance_size());
   cls = object_store->uint16_array_class();
@@ -238,8 +240,8 @@
   ASSERT(Float64Array::InstanceSize() == cls.instance_size());
   cls = object_store->external_int8_array_class();
   ASSERT(ExternalInt8Array::InstanceSize() == cls.instance_size());
-  cls = object_store->external_uint8_array_class();
-  ASSERT(ExternalUint8Array::InstanceSize() == cls.instance_size());
+  cls = object_store->external_uint8_clamped_array_class();
+  ASSERT(ExternalUint8ClampedArray::InstanceSize() == cls.instance_size());
   cls = object_store->external_int16_array_class();
   ASSERT(ExternalInt16Array::InstanceSize() == cls.instance_size());
   cls = object_store->external_uint16_array_class();
@@ -321,7 +323,7 @@
   const Class& super_class = Class::Handle(super_type.type_class());
   // If cls belongs to core lib or to core lib's implementation, restrictions
   // about allowed interfaces are lifted.
-  if (cls.library() != Library::CoreLibrary()) {
+  if ((cls.library() != Library::CoreLibrary())) {
     // Prevent extending core implementation classes.
     bool is_error = false;
     switch (super_class.id()) {
@@ -342,7 +344,9 @@
       case kInt8ArrayCid:
       case kExternalInt8ArrayCid:
       case kUint8ArrayCid:
+      case kUint8ClampedArrayCid:
       case kExternalUint8ArrayCid:
+      case kExternalUint8ClampedArrayCid:
       case kInt16ArrayCid:
       case kExternalInt16ArrayCid:
       case kUint16ArrayCid: