Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/Display/Source/NavigationBarContentNode.swift

@@ -0,0 +1,31 @@
+import Foundation
+import UIKit
+import AsyncDisplayKit
+
+public enum NavigationBarContentMode {
+    case replacement
+    case expansion
+}
+
+open class NavigationBarContentNode: ASDisplayNode {
+    open var requestContainerLayout: (ContainedViewLayoutTransition) -> Void = { _ in }
+    
+    open var height: CGFloat {
+        return self.nominalHeight
+    }
+    
+    open var clippedHeight: CGFloat {
+        return self.nominalHeight
+    }
+    
+    open var nominalHeight: CGFloat {
+        return 44.0
+    }
+    
+    open var mode: NavigationBarContentMode {
+        return .replacement
+    }
+    
+    open func updateLayout(size: CGSize, leftInset: CGFloat, rightInset: CGFloat, transition: ContainedViewLayoutTransition) {
+    }
+}