[wasm] Implement stepping in wasm code

src/frames.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.
 
 #ifndef V8_FRAMES_H_
 #define V8_FRAMES_H_
 
 #include "src/allocation.h"
 #include "src/handles.h"
 #include "src/safepoint-table.h"
@@ skipping 1444 matching lines @@
   void Reset(ThreadLocalTop* top);
 
   DISALLOW_COPY_AND_ASSIGN(StackFrameIterator);
 };
 
 // Iterator that supports iterating through all JavaScript frames.
 class JavaScriptFrameIterator BASE_EMBEDDED {
  public:
   inline explicit JavaScriptFrameIterator(Isolate* isolate);
   inline JavaScriptFrameIterator(Isolate* isolate, ThreadLocalTop* top);
-  // Skip frames until the frame with the given id is reached.
-  JavaScriptFrameIterator(Isolate* isolate, StackFrame::Id id);
 
   inline JavaScriptFrame* frame() const;
 
   bool done() const { return iterator_.done(); }
   void Advance();
 
   // Advance to the frame holding the arguments for the current
   // frame. This only affects the current frame if it has adapted
   // arguments.
   void AdvanceToArgumentsFrame();
 
  private:
   StackFrameIterator iterator_;
 };
 
 // NOTE: The stack trace frame iterator is an iterator that only traverse proper
 // JavaScript frames that have proper JavaScript functions and WASM frames.
 // This excludes the problematic functions in runtime.js.
 class StackTraceFrameIterator BASE_EMBEDDED {
  public:
   explicit StackTraceFrameIterator(Isolate* isolate);
+  // Skip frames until the frame with the given id is reached.
   StackTraceFrameIterator(Isolate* isolate, StackFrame::Id id);
   bool done() const { return iterator_.done(); }
   void Advance();
 
   inline StandardFrame* frame() const;
 
   inline bool is_javascript() const;
   inline bool is_wasm() const;
   inline JavaScriptFrame* javascript_frame() const;
 
@@ skipping 51 matching lines @@
 
 
 // Reads all frames on the current stack and copies them into the current
 // zone memory.
 Vector<StackFrame*> CreateStackMap(Isolate* isolate, Zone* zone);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FRAMES_H_