Enable inspector tests disabled when dart:html was switched to JS interop.

Source/bindings/core/dart/DartHandleProxy.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 45 matching lines @@
 static v8::Local<v8::FunctionTemplate> frameProxyTemplate();
 
 DartPersistentValue* DartHandleProxy::readPointerFromProxy(v8::Handle<v8::Value> proxy)
 {
     void* pointer = proxy.As<v8::Object>()->GetAlignedPointerFromInternalField(0);
     return static_cast<DartPersistentValue*>(pointer);
 }
 
 bool DartHandleProxy::isDartProxy(v8::Handle<v8::Value> value)
 {
+    return isDartProxy(value, v8::Isolate::GetCurrent());
+}
+
+bool DartHandleProxy::isDartProxy(v8::Handle<v8::Value> value, v8::Isolate* v8Isolate)
+{
     if (!value.IsEmpty() && value->IsObject()) {
-        v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
         v8::Local<v8::Value> hiddenValue = value.As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "dartProxy"));
         return *hiddenValue && hiddenValue->IsBoolean();
     }
     return false;
 }
 
 bool isGlobalObjectProxy(v8::Handle<v8::Object> value)
 {
     v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
     v8::Local<v8::Value> hiddenValue = value.As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "asGlobal"));
@@ skipping 1163 matching lines @@
     for (intptr_t i = 0; i < length; i ++)
         dartFunctionArgs.append(Dart_ListGetAt(wrappedExpressionArgs, i));
 
     Dart_Handle result = Dart_InvokeClosure(closure, dartFunctionArgs.size(), dartFunctionArgs.data());
     if (Dart_IsError(result))
         return V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, Dart_GetError(result)), v8::Isolate::GetCurrent());
     return DartHandleProxy::create(result);
 }
 
 }