[Extensions Bindings] Add enum support

extensions/renderer/native_extension_bindings_system_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/renderer/native_extension_bindings_system.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "components/crx_file/id_util.h"
@@ skipping 130 matching lines @@
   v8::Local<v8::Value> chrome =
       GetPropertyFromObject(context->Global(), context, "chrome");
   ASSERT_FALSE(chrome.IsEmpty());
   ASSERT_TRUE(chrome->IsObject());
 
   v8::Local<v8::Value> idle = GetPropertyFromObject(
       v8::Local<v8::Object>::Cast(chrome), context, "idle");
   ASSERT_FALSE(idle.IsEmpty());
   ASSERT_TRUE(idle->IsObject());
 
-  v8::Local<v8::Value> idle_query_state = GetPropertyFromObject(
-      v8::Local<v8::Object>::Cast(idle), context, "queryState");
+  v8::Local<v8::Object> idle_object = v8::Local<v8::Object>::Cast(idle);
+  v8::Local<v8::Value> idle_query_state =
+      GetPropertyFromObject(idle_object, context, "queryState");
   ASSERT_FALSE(idle_query_state.IsEmpty());
 
+  EXPECT_EQ(ReplaceSingleQuotes(
+                "{'ACTIVE':'active','IDLE':'idle','LOCKED':'locked'}"),
+            GetStringPropertyFromObject(idle_object, context, "IdleState"));
+
   {
     // Try calling the function with an invalid invocation - an error should be
     // thrown.
     const char kCallIdleQueryStateInvalid[] =
         "(function() {\n"
         "  chrome.idle.queryState('foo', function(state) {\n"
         "    this.responseState = state;\n"
         "  });\n"
         "});";
     v8::Local<v8::Function> function =
@@ skipping 172 matching lines @@
   // Next, we need to check two pieces: first, that the custom handler was
   // called with the proper arguments....
   EXPECT_EQ("30", GetStringPropertyFromObject(global, context, "timeArg"));
 
   // ...and second, that the callback was called with the proper result.
   EXPECT_EQ("\"active\"",
             GetStringPropertyFromObject(global, context, "responseState"));
 }
 
 }  // namespace extensions