Add an API function to get a debugger stack trace from an error handle.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 6093 matching lines @@
 
  private:
   void set_code_array(const Array& code_array) const;
   void set_pc_offset_array(const Array& pc_offset_array) const;
   void set_catch_code_array(const Array& code_array) const;
   void set_catch_pc_offset_array(const Array& pc_offset_array) const;
   bool expand_inlined() const;
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Stacktrace, Instance);
   friend class Class;
+  friend class Debugger;
 };
 
 
 // Internal JavaScript regular expression object.
 class JSRegExp : public Instance {
  public:
   // Meaning of RegExType:
   // kUninitialized: the type of th regexp has not been initialized yet.
   // kSimple: A simple pattern to match against, using string indexOf operation.
   // kComplex: A complex pattern to match.
@@ skipping 257 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_