Adding checks for V8 functions returning Maybe<bool>

third_party/WebKit/Source/bindings/core/v8/V8PagePopupControllerBinding.cpp

 // Copyright 2015 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 "bindings/core/v8/V8PagePopupControllerBinding.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8Window.h"
 #include "core/dom/ContextFeatures.h"
 #include "core/dom/Document.h"
@@ skipping 22 matching lines @@
 
 } // namespace
 
 void V8PagePopupControllerBinding::installPagePopupController(v8::Local<v8::Context> context, v8::Local<v8::Object> windowWrapper)
 {
     ExecutionContext* executionContext = toExecutionContext(windowWrapper->CreationContext());
     if (!(executionContext && executionContext->isDocument()
         && ContextFeatures::pagePopupEnabled(toDocument(executionContext))))
         return;
 
-    windowWrapper->SetAccessor(
+    if (windowWrapper->SetAccessor(
         context,
         v8AtomicString(context->GetIsolate(), "pagePopupController"),
-        pagePopupControllerAttributeGetterCallback);
+        pagePopupControllerAttributeGetterCallback).IsNothing()) {
+        // TODO: What action should, if any, should be taken here?
+    }
 }
 
 } // namespace blink