Profile dynamic calls.

tool/input_sdk/private/debugger.dart

Index: tool/input_sdk/private/debugger.dart
diff --git a/tool/input_sdk/private/debugger.dart b/tool/input_sdk/private/debugger.dart
index 43d553d2e171c45c9bb0fcb2f113a4915d396d16..975ad5eed40fec8fec195adfc616e45de7b5ae69 100644
--- a/tool/input_sdk/private/debugger.dart
+++ b/tool/input_sdk/private/debugger.dart
@@ -10,12 +10,17 @@ import 'dart:core';
 import 'dart:collection';
 import 'dart:html' as html;
 
-/// Config object to pass to devtools to signal that an object should not be
+/// Config String to pass to devtools to signal that an object should not be
 /// formatted by the Dart formatter. This is used to specify that an Object
 /// should just be displayed using the regular JavaScript view instead of a
 /// custom Dart view. For example, this is used to display the JavaScript view
 /// of a Dart Function as a child of the regular Function object.
-const skipDartConfig = const Object();
+const skipDartConfig = "skipDartConfig";
+
+/// Config String to pass to devtools to signal that a map key object should
+/// have its toString() displayed by the Dart formatter.
+const keyToStringConfig = "keyToStringConfig";
+
 final int maxIterableChildrenToDisplay = 50;
 
 var _devtoolsFormatter = new JsonMLFormatter(new DartFormatter());
@@ -85,8 +90,9 @@ bool hasMethod(object, String name) {
 
 /// [JsonMLFormatter] consumes [NameValuePair] objects and
 class NameValuePair {
-  NameValuePair({this.name, this.value, bool skipDart})
-      : skipDart = skipDart == true;
+  NameValuePair({this.name, this.value, bool skipDart, bool keyToString})
+      : skipDart = skipDart == true,
+        keyToString = keyToString == true;
 
   // Define equality and hashCode so that NameValuePair can be used
   // in a Set to dedupe entries with duplicate names.
@@ -96,12 +102,13 @@ class NameValuePair {
   final String name;
   final Object value;
   final bool skipDart;
+  final bool keyToString;
 }
 
 class MapEntry {
   MapEntry({this.key, this.value});
 
-  final String key;
+  final Object key;
   final Object value;
 }
 
@@ -200,6 +207,10 @@ class JsonMLFormatter {
     var c = _simpleFormatter.preview(object);
     if (c == null) return null;
 
+    if (identical(config, keyToStringConfig)) {
+      c = object.toString();
+    }
+
     // Indicate this is a Dart Object by using a Dart background color.
     // This is stylistically a bit ugly but it eases distinguishing Dart and
     // JS objects.
@@ -233,6 +244,9 @@ class JsonMLFormatter {
         if (child.skipDart) {
           objectTag.addAttribute('config', skipDartConfig);
         }
+        if (child.keyToString) {
+          objectTag.addAttribute('config', keyToStringConfig);
+        }
         if (!_simpleFormatter.hasChildren(child.value)) {
           li.setStyle("padding-left: 13px;");
         }
@@ -561,7 +575,7 @@ class MapEntryFormatter implements Formatter {
   bool hasChildren(object) => true;
 
   List<NameValuePair> children(object) => <NameValuePair>[
-        new NameValuePair(name: 'key', value: object.key),
+        new NameValuePair(name: 'key', value: object.key, keyToString: true),
         new NameValuePair(name: 'value', value: object.value)
       ];
 }