Fix signature for external string API methods.

vm/dart_api_impl.cc

 // Copyright (c) 2011, 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 885 matching lines @@
 
 
 DART_EXPORT Dart_Handle Dart_NewString32(const uint32_t* codepoints,
                                          intptr_t length) {
   DARTSCOPE(Isolate::Current());
   const String& obj = String::Handle(String::New(codepoints, length));
   return Api::NewLocalHandle(obj);
 }
 
 
-DART_EXPORT Dart_Handle Dart_NewExternalString8(uint8_t* codepoints,
+DART_EXPORT Dart_Handle Dart_NewExternalString8(const uint8_t* codepoints,
                                                 intptr_t length,
                                                 void* peer,
                                                 Dart_PeerFinalizer callback) {
   DARTSCOPE(Isolate::Current());
   const String& obj =
       String::Handle(String::NewExternal(codepoints, length, peer, callback));
   return Api::NewLocalHandle(obj);
 }
 
 
-DART_EXPORT Dart_Handle Dart_NewExternalString16(uint16_t* codepoints,
+DART_EXPORT Dart_Handle Dart_NewExternalString16(const uint16_t* codepoints,
                                                  intptr_t length,
                                                  void* peer,
                                                  Dart_PeerFinalizer callback) {
   DARTSCOPE(Isolate::Current());
   const String& obj =
       String::Handle(String::NewExternal(codepoints, length, peer, callback));
   return Api::NewLocalHandle(obj);
 }
 
 
-DART_EXPORT Dart_Handle Dart_NewExternalString32(uint32_t* codepoints,
+DART_EXPORT Dart_Handle Dart_NewExternalString32(const uint32_t* codepoints,
                                                  intptr_t length,
                                                  void* peer,
                                                  Dart_PeerFinalizer callback) {
   DARTSCOPE(Isolate::Current());
   const String& obj =
       String::Handle(String::NewExternal(codepoints, length, peer, callback));
   return Api::NewLocalHandle(obj);
 }
 
 
@@ skipping 1257 matching lines @@
   ASSERT(isolate != NULL);
   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
   ApiLocalScope* scope = state->top_scope();
   ASSERT(scope != NULL);
   return scope->zone().Reallocate(ptr, old_size, new_size);
 }
 
 
 }  // namespace dart