Bug 1209780. Use the DrawResult return value of imgIContainer::Draw in the cocoa code. r=seth

widget/cocoa/nsCocoaUtils.mm

@@ -492,10 +492,15 @@ nsresult nsCocoaUtils::CreateNSImageFromImageContainer(imgIContainer *aImage, ui
       return NS_ERROR_FAILURE;
     }
 
+    mozilla::image::DrawResult res =
       aImage->Draw(context, scaledSize, ImageRegion::Create(scaledSize),
                    aWhichFrame, Filter::POINT, Nothing(),
                    imgIContainer::FLAG_SYNC_DECODE);
 
+    if (res != mozilla::image::DrawResult::SUCCESS) {
+      return NS_ERROR_FAILURE;
+    }
+
     surface = drawTarget->Snapshot();
   } else {
     surface = aImage->GetFrame(aWhichFrame, imgIContainer::FLAG_SYNC_DECODE);