Also attempt to symbolize dart frames in Profiler::DumpStackTrace.

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index 21b8bf80871d4a778e0b9d3ea6951737ae2bb552..c1a74e45d2606587429a6015f88490ff39b91d42 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -334,14 +334,29 @@ static void DumpStackFrame(intptr_t frame_index, uword pc) {
   uintptr_t start = 0;
   char* native_symbol_name =
       NativeSymbolResolver::LookupSymbolName(pc, &start);
-  if (native_symbol_name == NULL) {
-    OS::PrintErr("Frame[%" Pd "] = `unknown symbol` [0x%" Px "]\n",
-                 frame_index, pc);
-  } else {
-    OS::PrintErr("Frame[%" Pd "] = `%s` [0x%" Px "]\n",
-                 frame_index, native_symbol_name, pc);
+  if (native_symbol_name != NULL) {
+    OS::PrintErr("  %" Pp " [native] %s\n", pc, native_symbol_name);
     NativeSymbolResolver::FreeSymbolName(native_symbol_name);
+    return;
+  }
+
+  Code& code = Code::Handle(Code::LookupCodeInVmIsolate(pc));
+  if (code.IsNull()) {
+    code = Code::LookupCode(pc);  // In current isolate.
+  }
+  if (code.IsNull()) {
+    OS::PrintErr("  %" Pp " [unknown]\n", pc);
+    return;
+  }
+
+  const Object& owner = Object::Handle(code.owner());
+  if (owner.IsFunction()) {
+    OS::PrintErr("  %" Pp " [dart] %s\n", pc,
+                 Function::Cast(owner).ToFullyQualifiedCString());
+    return;
   }
+
+  OS::PrintErr("  %" Pp " [stub] %s\n", pc, code.ToCString());
 }
 
 
@@ -350,10 +365,17 @@ static void DumpStackFrame(intptr_t frame_index,
                            const Code& code) {
   if (code.IsNull()) {
     DumpStackFrame(frame_index, pc);
-  } else {
-    OS::PrintErr("Frame[%" Pd "] = Dart:`%s` [0x%" Px "]\n",
-                 frame_index, code.ToCString(), pc);
+    return;
   }
+
+  const Object& owner = Object::Handle(code.owner());
+  if (owner.IsFunction()) {
+    OS::PrintErr("  %" Pp " [dart] %s\n", pc,
+                 Function::Cast(owner).ToFullyQualifiedCString());
+    return;
+  }
+
+  OS::PrintErr("  %" Pp " [stub] %s\n", pc, code.ToCString());
 }