- Implement a first cut for const String.env in the VM to allow

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
@@ skipping 3896 matching lines @@
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   Isolate* isolate = arguments->isolate();
   CHECK_ISOLATE(isolate);
   ASSERT(isolate->api_state() != NULL &&
          (isolate->api_state()->IsValidWeakPersistentHandle(rval) ||
           isolate->api_state()->IsValidPrologueWeakPersistentHandle(rval)));
   Api::SetWeakHandleReturnValue(arguments, rval);
 }
 
 
+// --- Configurations ---
+DART_EXPORT Dart_Handle Dart_SetEnvironmentCallback(
+    Dart_EnvironmentCallback callback) {
+  Isolate* isolate = Isolate::Current();
+  CHECK_ISOLATE(isolate);
+  isolate->set_environment_callback(callback);
+  return Api::Success();
+}
+
+
+// --- Scripts and Libraries ---
 DART_EXPORT void Dart_SetBooleanReturnValue(Dart_NativeArguments args,
                                             bool retval) {
   TRACE_API_CALL(CURRENT_FUNC);
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   arguments->SetReturn(Bool::Get(retval));
 }
 
 
 DART_EXPORT void Dart_SetIntegerReturnValue(Dart_NativeArguments args,
                                             int64_t retval) {
@@ skipping 482 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success();
 }
 
 }  // namespace dart