Make ContentView public

.swiftpm/xcode/xcshareddata/xcschemes/ScrollingContentViewController.xcscheme

@@ -20,6 +20,20 @@
                ReferencedContainer = "container:">
             </BuildableReference>
          </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "Common"
+               BuildableName = "Common"
+               BlueprintName = "Common"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
       </BuildActionEntries>
    </BuildAction>
    <TestAction

Tests/Common/ContentView.swift

@@ -10,15 +10,15 @@
 
 import UIKit
 
-/// A view assigned `contentView` property in StoryboardTests.storyboard.
-class ContentView: UIView {
+/// A content view used by `StoryboardTests`, `CodeTests`, and `ManagerTests`.
+public class ContentView: UIView {
 
     /// A constraint that determines the view's width.
-    var widthConstraint: NSLayoutConstraint!
+    public var widthConstraint: NSLayoutConstraint!
 
     /// A constraint that determine the view's height. This constraint's constant is
     /// manipulated externally to test the behavior of views of varying heights.
-    var heightConstraint: NSLayoutConstraint!
+    public var heightConstraint: NSLayoutConstraint!
 
     override init(frame: CGRect) {
         super.init(frame: frame)