Fix call stack sampling for the case when native callback invokes JS function

src/frames.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 29 matching lines @@
 // Get the number of registers in a given register list.
 int NumRegs(RegList list);
 
 void SetUpJSCallerSavedCodeData();
 
 // Return the code of the n-th saved register available to JavaScript.
 int JSCallerSavedCode(int n);
 
 
 // Forward declarations.
+class ExternalCallbackScope;
 class StackFrameIteratorBase;
 class ThreadLocalTop;
 class Isolate;
 
 class InnerPointerToCodeCache {
  public:
   struct InnerPointerToCodeCacheEntry {
     Address inner_pointer;
     Code* code;
     SafepointEntry safepoint_entry;
@@ skipping 816 matching lines @@
   bool IsValidFrame();
 };
 
 
 class SafeStackFrameIterator: public StackFrameIteratorBase {
  public:
   SafeStackFrameIterator(Isolate* isolate,
                          Address fp, Address sp,
                          Address js_entry_sp);
 
-  inline JavaScriptFrame* frame() const;
+  inline StackFrame* frame() const;
   void Advance();
 
   StackFrame::Type top_frame_type() const { return top_frame_type_; }
 
  private:
   void AdvanceOneFrame();
 
   bool IsValidStackAddress(Address addr) const {
     return low_bound_ <= addr && addr <= high_bound_;
   }
   bool IsValidFrame(StackFrame* frame) const;
   bool IsValidCaller(StackFrame* frame);
   bool IsValidExitFrame(Address fp) const;
   bool IsValidTop(ThreadLocalTop* top) const;
 
   const Address low_bound_;
   const Address high_bound_;
   StackFrame::Type top_frame_type_;
+  ExternalCallbackScope* external_callback_scope_;
 };
 
 
 class StackFrameLocator BASE_EMBEDDED {
  public:
   explicit StackFrameLocator(Isolate* isolate) : iterator_(isolate) {}
 
   // Find the nth JavaScript frame on the stack. The caller must
   // guarantee that such a frame exists.
   JavaScriptFrame* FindJavaScriptFrame(int n);
 
  private:
   StackFrameIterator iterator_;
 };
 
 
 // Reads all frames on the current stack and copies them into the current
 // zone memory.
 Vector<StackFrame*> CreateStackMap(Isolate* isolate, Zone* zone);
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_H_