Added infrastructure for optimizing new CanvasArray types in WebGL...

src/handles.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 327 matching lines @@
 
 
 Handle<String> SubString(Handle<String> str, int start, int end) {
   CALL_HEAP_FUNCTION(str->Slice(start, end), String);
 }
 
 
 Handle<Object> SetElement(Handle<JSObject> object,
                           uint32_t index,
                           Handle<Object> value) {
-  if (object->HasPixelElements()) {
+  if (object->HasPixelElements() || object->HasExternalArrayElements()) {
     if (!value->IsSmi() && !value->IsHeapNumber() && !value->IsUndefined()) {
       bool has_exception;
       Handle<Object> number = Execution::ToNumber(value, &has_exception);
       if (has_exception) return Handle<Object>();
       value = number;
     }
   }
   CALL_HEAP_FUNCTION(object->SetElement(index, *value), Object);
 }
 
@@ skipping 398 matching lines @@
   Handle<Map> new_map = Factory::CopyMapDropTransitions(old_map);
   obj->set_map(*new_map);
   new_map->set_needs_loading(true);
   // Store the lazy loading info in the constructor field.  We'll
   // reestablish the constructor from the fixed array after loading.
   new_map->set_constructor(*arr);
   ASSERT(!obj->IsLoaded());
 }
 
 } }  // namespace v8::internal