Support Dart debugger API directly

tools/dom/idl/dart/dart.idl

 // This file introduces / supplements and forces Dart declarations.
 
 [Supplemental,
  Constructor]
 interface AudioContext {
   // TODO(ager): Auto-generate this custom method when the info about retaining
   // typed arrays is in the IDL.
   [Custom] void decodeAudioData(ArrayBuffer audioData, AudioBufferCallback successCallback, AudioBufferCallback errorCallback);
 };
 
@@ skipping 306 matching lines @@
    [Custom] void send(Blob data);
    [Custom] void send(Document data);
    [Custom] void send([StrictTypeChecking] DOMString data);
    [Custom] void send(FormData data);
 };
 
 [Suppressed]
 interface AbstractView {};
 
 
-[Suppressed]
-interface InjectedScriptHost {};
+interface InjectedScriptHost {
+    [Custom] void inspect(any objectId, any hints);
+    [Suppressed, Custom] any inspectedObject(long num);
+    [Suppressed, Custom] any internalConstructorName(any obj);
+    [Suppressed, Custom] boolean isHTMLAllCollection(any obj);
+    [Suppressed, Custom] DOMString type(any obj);
+    [Suppressed, Custom] any functionDetails(any obj);
+    [Suppressed, Custom] any[] getInternalProperties(any obj);
+    [Suppressed, Custom] EventListener[] getEventListeners(EventTarget target);
+    [Suppressed, Custom] any evaluate(DOMString text);
+    [Suppressed, Custom] void debugFunction(any fn);
+    [Suppressed, Custom] void undebugFunction(any fn);
+    [Suppressed, Custom] void monitorFunction(any fn);
+    [Suppressed, Custom] void unmonitorFunction(any fn);
+
+    // Only declarative scope (local, with and catch) is accepted. Returns undefined.
+    [Suppressed, Custom] any setFunctionVariableValue(any functionObject, long scopeIndex, DOMString variableName, any newValue);
+};
 
 
 [Suppressed]
 interface InspectorFrontendHost {};
 
 
 [Suppressed]
 interface JavaScriptCallFrame {};
 
 
@@ skipping 33 matching lines @@
 [Suppressed]
 interface Promise {};
 
 [Supplemental]
 interface Screen {
     [Suppressed]
     boolean lockOrientation(sequence<DOMString> orientations);
 };
 
 Element implements GlobalEventHandlers;