Add WasmFrame, backtraces reflect wasm's presence

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 50a2e21a055d7a9d8f11442f6cfa024d555c71dc..b88b73da8db84d033ea628ed312e0a25d72f8123 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -134,12 +134,10 @@ StackFrame* StackFrameIteratorBase::SingletonFor(StackFrame::Type type) {
 #undef FRAME_TYPE_CASE
 }
 
-
 // -------------------------------------------------------------------------
 
-
-JavaScriptFrameIterator::JavaScriptFrameIterator(
-    Isolate* isolate, StackFrame::Id id)
+JavaScriptFrameIterator::JavaScriptFrameIterator(Isolate* isolate,
+                                                 StackFrame::Id id)
     : iterator_(isolate) {
   while (!done()) {
     Advance();
@@ -446,7 +444,7 @@ StackFrame::Type StackFrame::ComputeType(const StackFrameIteratorBase* iterator,
       case Code::OPTIMIZED_FUNCTION:
         return OPTIMIZED;
       case Code::WASM_FUNCTION:
-        return STUB;
+        return WASM;
       case Code::BUILTIN:
         if (!marker->IsSmi()) {
           if (StandardFrame::IsArgumentsAdaptorFrame(state->fp)) {
@@ -1222,6 +1220,20 @@ void StackFrame::PrintIndex(StringStream* accumulator,
   accumulator->Add((mode == OVERVIEW) ? "%5d: " : "[%d]: ", index);
 }
 
+void WasmFrame::Print(StringStream* accumulator, PrintMode mode,
+                      int index) const {
+  accumulator->Add("wasm frame");
+}
+
+Code* WasmFrame::unchecked_code() const {
+  return static_cast<Code*>(isolate()->FindCodeObject(pc()));
+}
+
+void WasmFrame::Iterate(ObjectVisitor* v) const { IterateCompiledFrame(v); }
+
+Address WasmFrame::GetCallerStackPointer() const {
+  return fp() + ExitFrameConstants::kCallerSPDisplacement;
+}
 
 namespace {