Reapply "Add support for timezone offset and timezone name."

runtime/vm/bootstrap_natives.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_BOOTSTRAP_NATIVES_H_
 #define VM_BOOTSTRAP_NATIVES_H_
 
 #include "vm/native_entry.h"
 
 // bootstrap dart natives used in the core dart library.
@@ skipping 82 matching lines @@
   V(MathNatives_parseInt, 1)                                                   \
   V(MathNatives_parseDouble, 1)                                                \
   V(DateNatives_brokenDownToSecondsSinceEpoch, 7)                              \
   V(DateNatives_currentTimeMillis, 0)                                          \
   V(DateNatives_getYear, 2)                                                    \
   V(DateNatives_getMonth, 2)                                                   \
   V(DateNatives_getDay, 2)                                                     \
   V(DateNatives_getHours, 2)                                                   \
   V(DateNatives_getMinutes, 2)                                                 \
   V(DateNatives_getSeconds, 2)                                                 \
+  V(DateNatives_timeZoneName, 1)                                               \
+  V(DateNatives_timeZoneOffsetInSeconds, 1)                                    \
   V(AssertionError_throwNew, 2)                                                \
   V(TypeError_throwNew, 5)                                                     \
   V(FallThroughError_throwNew, 1)                                              \
   V(StaticResolutionException_throwNew, 1)                                     \
   V(Clock_now, 0)                                                              \
   V(Clock_frequency, 0)                                                        \
   V(ByteArray_getLength, 1)                                                    \
   V(ByteArray_getInt8, 2)                                                      \
   V(ByteArray_setInt8, 3)                                                      \
   V(ByteArray_getUint8, 2)                                                     \
@@ skipping 75 matching lines @@
   V(GrowableObjectArray_getLength, 1)                                          \
   V(GrowableObjectArray_getCapacity, 1)                                        \
   V(GrowableObjectArray_setLength, 2)                                          \
   V(GrowableObjectArray_setData, 2)                                            \
 
 BOOTSTRAP_NATIVE_LIST(DECLARE_NATIVE_ENTRY)
 
 }  // namespace dart
 
 #endif  // VM_BOOTSTRAP_NATIVES_H_