Imported Upstream version 5.10.0.47

Former-commit-id: d0813289fa2d35e1f8ed77530acb4fb1df441bc0

mcs/class/referencesource/System.Configuration/System/Configuration/SectionInput.cs

@@ -15,8 +15,14 @@ namespace System.Configuration {
         private static object                   s_unevaluated = new object();
 
         // input from the XML file
-        private SectionXmlInfo                  _sectionXmlInfo;        
+        private SectionXmlInfo                  _sectionXmlInfo;
 
+        // Provider to enhance config sources
+        private ConfigurationBuilder _configBuilder;
+
+        // Has the config provider been determined for this input?
+        private bool _isConfigBuilderDetermined;
+        
         // Provider to use for encryption
         private ProtectedConfigurationProvider  _protectionProvider;    
 
@@ -79,6 +85,18 @@ namespace System.Configuration {
             _resultRuntimeObject = s_unevaluated;
         }
 
+        internal bool IsConfigBuilderDetermined {
+            get { return _isConfigBuilderDetermined; }
+        }
+
+        internal ConfigurationBuilder ConfigBuilder {
+            get { return _configBuilder; }
+            set {
+                _configBuilder = value;
+                _isConfigBuilderDetermined = true;
+            }
+        }
+
         internal bool IsProtectionProviderDetermined {
             get {return _isProtectionProviderDetermined;}
         }