Add ActivationFrame_GetFramePointer method and test.

runtime/include/dart_debugger_api.h

 // Copyright (c) 2011, 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 INCLUDE_DART_DEBUGGER_API_H_
 #define INCLUDE_DART_DEBUGGER_API_H_
 
 #include "include/dart_api.h"
 
 typedef struct _Dart_Breakpoint* Dart_Breakpoint;
@@ skipping 444 matching lines @@
  * \return A handle to the True object if no error occurs.
  *         A handle to the False object if there is no text
  *         position for the frame.
  */
 DART_EXPORT Dart_Handle Dart_ActivationFrameGetLocation(
                             Dart_ActivationFrame activation_frame,
                             Dart_Handle* function_name,
                             Dart_Handle* function,
                             Dart_CodeLocation* location);
 
+/**
+ * Returns frame pointer of the given activation frame.
+ *
+ * \frame_pointer receives the frame pointer for the frame.
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to the True object if no error occurs.
+ */
+DART_EXPORT Dart_Handle Dart_ActivationFrameGetFramePointer(
+                            Dart_ActivationFrame activation_frame,
+                            uintptr_t* frame_pointer);
 
 /**
  * Returns an array containing all the local variable names and values of
  * the given \activation_frame.
  *
  * Requires there to be a current isolate.
  *
  * \return A handle to an array containing variable names and
  * corresponding values. The array is empty if the activation frame has
  * no variables. If non-empty, variable names are at array offsets 2*n,
@@ skipping 245 matching lines @@
 
 
 /**
  * Returns the isolate id for an isolate.
  *
  * \return The Dart_IsolateId value corresponding to the isolate.
  */
 DART_EXPORT Dart_IsolateId Dart_GetIsolateId(Dart_Isolate isolate);
 
 #endif  // INCLUDE_DART_DEBUGGER_API_H_