Add some support for the code-point code-unit distinction.

runtime/vm/dart_api_impl.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 "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 1682 matching lines @@
                                            intptr_t* length) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const String& str_obj = Api::UnwrapStringHandle(isolate, str);
   if (str_obj.IsNull()) {
     RETURN_TYPE_ERROR(isolate, str, String);
   }
   intptr_t str_len = str_obj.Length();
   intptr_t copy_len = (str_len > *length) ? *length : str_len;
   for (intptr_t i = 0; i < copy_len; i++) {
-    utf16_array[i] = static_cast<uint16_t>(str_obj.CharAt(i));
+    utf16_array[i] = static_cast<uint16_t>(str_obj.CodeUnitAt(i));
   }
   *length = copy_len;
   return Api::Success(isolate);
 }
 
 
 // --- Lists ---
 
 
 static RawInstance* GetListInstance(Isolate* isolate, const Object& obj) {
@@ skipping 877 matching lines @@
   }
   return Api::NewHandle(isolate, cls.signature_function());
 }
 
 
 // --- Function and Variable Reflection ---
 
 
 // Outside of the vm, we expose setter names with a trailing '='.
 static bool HasExternalSetterSuffix(const String& name) {
-  return name.CharAt(name.Length() - 1) == '=';
+  return name.CodeUnitAt(name.Length() - 1) == '=';
 }
 
 
 static RawString* RemoveExternalSetterSuffix(const String& name) {
   ASSERT(HasExternalSetterSuffix(name));
   return String::SubString(name, 0, name.Length() - 1);
 }
 
 
 DART_EXPORT Dart_Handle Dart_GetFunctionNames(Dart_Handle target) {
@@ skipping 1832 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success(isolate);
 }
 
 }  // namespace dart