Reland transformation of async functions.

runtime/vm/symbols.h

 // 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.
 
 #ifndef VM_SYMBOLS_H_
 #define VM_SYMBOLS_H_
 
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
 
@@ skipping 50 matching lines @@
   V(SavedTryContextVar, ":saved_try_context_var")                              \
   V(ExceptionVar, ":exception_var")                                            \
   V(StackTraceVar, ":stack_trace_var")                                         \
   V(ListLiteralElement, "list literal element")                                \
   V(ForInIter, ":for-in-iter")                                                 \
   V(ClosureFunctionField, ":function")                                         \
   V(ClosureContextField, ":context")                                           \
   V(Library, "library")                                                        \
   V(LoadLibrary, "loadLibrary")                                                \
   V(_LibraryPrefix, "_LibraryPrefix")                                          \
+  V(Async, "async")                                                            \
+  V(AsyncCompleter, ":async_completer")                                        \
+  V(AsyncOperation, ":async_op")                                               \
+  V(Future, "Future")                                                          \
+  V(FutureConstructor, "Future.")                                              \
+  V(Completer, "Completer")                                                    \
+  V(CompleterComplete, "complete")                                             \
+  V(CompleterConstructor, "Completer.")                                        \
+  V(CompleterFuture, "future")                                                 \
   V(Native, "native")                                                          \
   V(Import, "import")                                                          \
   V(Source, "source")                                                          \
   V(Class, "Class")                                                            \
   V(Null, "Null")                                                              \
   V(Dynamic, "dynamic")                                                        \
   V(Void, "void")                                                              \
   V(UnresolvedClass, "UnresolvedClass")                                        \
   V(Type, "_Type")                                                             \
   V(TypeRef, "_TypeRef")                                                       \
@@ skipping 458 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_