Add basic C++ implementation of CPU profiler.

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 3bf4c93e39893bba2031a58dd984e9ba450603c1..227fa67d54b2ba854a2682c890a8ae6bc4efe9a5 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -520,6 +520,31 @@ void JavaScriptFrame::Print(StringStream* accumulator,
   Code* code = NULL;
   if (IsConstructor()) accumulator->Add("new ");
   accumulator->PrintFunction(function, receiver, &code);
+
+  if (function->IsJSFunction()) {
+    Handle<SharedFunctionInfo> shared(JSFunction::cast(function)->shared());
+    Object* script_obj = shared->script();
+    if (script_obj->IsScript()) {
+      Handle<Script> script(Script::cast(script_obj));
+      accumulator->Add(" [");
+      accumulator->PrintName(script->name());
+
+      Address pc = this->pc();
+      if (code != NULL && code->kind() == Code::FUNCTION &&
+          pc >= code->instruction_start() && pc < code->relocation_start()) {
+        int source_pos = code->SourcePosition(pc);
+        int line = GetScriptLineNumberSafe(script, source_pos) + 1;
+        accumulator->Add(":%d", line);
+      } else {
+        int function_start_pos = shared->start_position();
+        int line = GetScriptLineNumberSafe(script, function_start_pos) + 1;
+        accumulator->Add(":~%d", line);
+      }
+
+      accumulator->Add("] ");
+    }
+  }
+
   accumulator->Add("(this=%o", receiver);
 
   // Get scope information for nicer output, if possible. If code is