Added Uint8ClampedList. COmpielr optimziations to follow in next CL.

runtime/lib/byte_array.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
@@ skipping 325 matching lines @@
 DEFINE_NATIVE_ENTRY(Uint8Array_getIndexed, 2) {
   GETTER(Uint8Array, Smi, uint8_t);
 }
 
 
 DEFINE_NATIVE_ENTRY(Uint8Array_setIndexed, 3) {
   SETTER(Uint8Array, Smi, Value, uint8_t);
 }
 
 
+// Uint8ClampedArray
+
+DEFINE_NATIVE_ENTRY(Uint8ClampedArray_new, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Uint8ClampedArray::kMaxElements);
+  return Uint8ClampedArray::New(len);
+}
+
+
+DEFINE_NATIVE_ENTRY(Uint8ClampedArray_newTransferable, 1) {
+  GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
+  intptr_t len = length.Value();
+  LengthCheck(len, Uint8ClampedArray::kMaxElements);
+  uint8_t* bytes = OS::AllocateAlignedArray<uint8_t>(
+      len,
+      ExternalByteArrayData<uint8_t>::kAlignment);
+  return ExternalUint8ClampedArray::New(bytes,
+                                        len,
+                                        bytes,
+                                        OS::AlignedFree);
+}
+
+
 // Int16Array
 
 DEFINE_NATIVE_ENTRY(Int16Array_new, 1) {
   GET_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(0));
   intptr_t len = length.Value();
   LengthCheck(len, Int16Array::kMaxElements);
   return Int16Array::New(len);
 }
 
 
@@ skipping 372 matching lines @@
 DEFINE_NATIVE_ENTRY(ExternalFloat64Array_getIndexed, 2) {
   GETTER(ExternalFloat64Array, Double, double);
 }
 
 
 DEFINE_NATIVE_ENTRY(ExternalFloat64Array_setIndexed, 3) {
   SETTER(ExternalFloat64Array, Double, value, double);
 }
 
 }  // namespace dart