Make Isolate::GetStackSample API support simulator

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 5782 matching lines @@
    *                     be large enough to hold the number of frames.
    * \param sample_info The sample info is filled up by the function
    *                    provides number of actual captured stack frames and
    *                    the current VM state.
    * \note GetStackSample should only be called when the JS thread is paused or
    *       interrupted. Otherwise the behavior is undefined.
    */
   void GetStackSample(const RegisterState& state, void** frames,
                       size_t frames_limit, SampleInfo* sample_info);
 
+  void GetStackSample(RegisterState* state, void** frames,

[alph, 2016/04/27 22:29:20]

Why do you need the second one?
Can it once being run under the simulator just ignore the state arg and extract
one from the simulator?

+                      size_t frames_limit, SampleInfo* sample_info);
+
   /**
    * Adjusts the amount of registered external memory. Used to give V8 an
    * indication of the amount of externally allocated memory that is kept alive
    * by JavaScript objects. V8 uses this to decide when to perform global
    * garbage collections. Registering externally allocated memory will trigger
    * global garbage collections more often than it would otherwise in an attempt
    * to garbage collect the JavaScript objects that keep the externally
    * allocated memory alive.
    *
    * \param change_in_bytes the change in externally allocated memory that is
@@ skipping 2961 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_