Added Uint8ClampedList. COmpielr optimziations to follow in next CL.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
===================================================================
--- runtime/vm/dart_api_impl.cc	(revision 15751)
+++ runtime/vm/dart_api_impl.cc	(working copy)
@@ -2010,6 +2010,7 @@
   DARTSCOPE(isolate);
   const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(list));
   if (obj.IsUint8Array() || obj.IsExternalUint8Array() ||
+      obj.IsUint8ClampedArray() || obj.IsExternalUint8ClampedArray() ||
       obj.IsInt8Array() || obj.IsExternalInt8Array()) {
     const ByteArray& byte_array = ByteArray::Cast(obj);
     if (Utils::RangeCheck(offset, length, byte_array.Length())) {
@@ -2095,7 +2096,8 @@
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(list));
-  if (obj.IsUint8Array() || obj.IsExternalUint8Array()) {
+  if (obj.IsUint8Array() || obj.IsExternalUint8Array() ||
+      obj.IsUint8ClampedArray() || obj.IsExternalUint8ClampedArray()) {

[cshapiro, 2012/12/05 23:01:49]

Maybe add the Int8Array cases for symmetry like on line 2014?

[srdjan, 2012/12/06 19:23:14]

The incoming type is uint8_t not int8_t?

     const ByteArray& byte_array = ByteArray::Cast(obj);
     if (Utils::RangeCheck(offset, length, byte_array.Length())) {
       ByteArray::Copy(byte_array, offset, native_array, length);