[wasm] Provide better stack traces for asm.js code

src/messages.h

Index: src/messages.h
diff --git a/src/messages.h b/src/messages.h
index e7bbcc34c2391af25586b557b81ed03dfe434fb6..a1994f6b59adb185eee89fa361f69622f1910ed4 100644
--- a/src/messages.h
+++ b/src/messages.h
@@ -148,8 +148,7 @@ class WasmStackFrame : public StackFrameBase {
 
   MaybeHandle<String> ToString() override;
 
- private:
-  void FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix);
+ protected:
   Handle<Object> Null() const;
 
   Isolate* isolate_;
@@ -159,9 +158,30 @@ class WasmStackFrame : public StackFrameBase {
   Handle<AbstractCode> code_;
   int offset_;
 
+ private:
+  void FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix);
+
   friend class FrameArrayIterator;
 };
 
+class AsmJsWasmStackFrame : public WasmStackFrame {
+ public:
+  virtual ~AsmJsWasmStackFrame() {}
+
+  Handle<Object> GetReceiver() const override;
+  Handle<Object> GetFunction() const override;
+
+  Handle<Object> GetFileName() override;
+  Handle<Object> GetFunctionName() override;
+  Handle<Object> GetScriptNameOrSourceUrl() override;
+
+  int GetPosition() const override;
+  int GetLineNumber() override;
+  int GetColumnNumber() override;
+
+  MaybeHandle<String> ToString() override;
+};
+
 class FrameArrayIterator {
  public:
   FrameArrayIterator(Isolate* isolate, Handle<FrameArray> array,
@@ -179,6 +199,7 @@ class FrameArrayIterator {
   int next_frame_ix_;
 
   WasmStackFrame wasm_frame_;
+  AsmJsWasmStackFrame asm_wasm_frame_;
   JSStackFrame js_frame_;
 };