Rename debugOwner to debugCreator

Fixes #2940

packages/flutter/lib/src/material/debug.dart

@@ -22,7 +22,7 @@ bool debugCheckHasMaterial(BuildContext context) {
         'The specific widget that could not find a Material ancestor was:\n'
         '  ${context.widget}'
         'The ownership chain for the affected widget is:\n'
-        '  ${element.debugGetOwnershipChain(10)}'
+        '  ${element.debugGetCreatorChain(10)}'
       );
     }
     return true;
@@ -41,7 +41,7 @@ bool debugCheckHasScaffold(BuildContext context) {
         'The specific widget that could not find a Scaffold ancestor was:\n'
         '  ${context.widget}'
         'The ownership chain for the affected widget is:\n'
-        '  ${element.debugGetOwnershipChain(10)}'
+        '  ${element.debugGetCreatorChain(10)}'
       );
     }
     return true;

packages/flutter/lib/src/rendering/layer.dart

@@ -73,7 +73,7 @@ abstract class Layer {
   @override
   String toString() => '$runtimeType';
 
-  dynamic debugOwner;
+  dynamic debugCreator;
 
   String toStringDeep([String prefixLineOne = '', String prefixOtherLines = '']) {
     String result = '$prefixLineOne$this\n';
@@ -89,8 +89,8 @@ abstract class Layer {
   }
 
   void debugFillDescription(List<String> description) {
-    if (debugOwner != null)
-      description.add('owner: $debugOwner');
+    if (debugCreator != null)
+      description.add('creator: $debugCreator');
   }
 
   String debugDescribeChildren(String prefix) => '';

packages/flutter/lib/src/rendering/object.dart

@@ -73,7 +73,7 @@ class PaintingContext {
     child._layer ??= new OffsetLayer();
     child._layer.removeAllChildren();
     assert(() {
-      child._layer.debugOwner = child.debugOwner ?? child.runtimeType;
+      child._layer.debugCreator = child.debugCreator ?? child.runtimeType;
       return true;
     });
     PaintingContext childContext = new PaintingContext._(child._layer, child.paintBounds);
@@ -111,7 +111,7 @@ class PaintingContext {
       });
       child._layer.detach();
       assert(() {
-        child._layer.debugOwner = child.debugOwner ?? child.runtimeType;
+        child._layer.debugCreator = child.debugCreator ?? child.runtimeType;
         return true;
       });
     }
@@ -871,7 +871,7 @@ abstract class RenderObject extends AbstractNode implements HitTestTarget {
   /// Override in subclasses with children and call the visitor for each child
   void visitChildren(RenderObjectVisitor visitor) { }
 
-  dynamic debugOwner;
+  dynamic debugCreator;
   static int _debugPrintedExceptionCount = 0;
   void _debugReportException(String method, dynamic exception, StackTrace stack) {
     try {
@@ -884,8 +884,8 @@ abstract class RenderObject extends AbstractNode implements HitTestTarget {
           debugPrint('The following exception was raised during $method():');
           debugPrint('$exception');
           debugPrint('The following RenderObject was being processed when the exception was fired:\n${this}');
-          if (debugOwner != null)
-            debugPrint('This RenderObject had the following owner:\n$debugOwner');
+          if (debugCreator != null)
+            debugPrint('This RenderObject had the following creator:\n$debugCreator');
           int depth = 0;
           List<String> descendants = <String>[];
           const int maxDepth = 5;
@@ -1803,8 +1803,8 @@ abstract class RenderObject extends AbstractNode implements HitTestTarget {
   /// per string. Subclasses should override this to have their information
   /// included in toStringDeep().
   void debugFillDescription(List<String> description) {
-    if (debugOwner != null)
-      description.add('owner: $debugOwner');
+    if (debugCreator != null)
+      description.add('creator: $debugCreator');
     description.add('parentData: $parentData');
     description.add('constraints: $constraints');
   }

packages/flutter/lib/src/widgets/framework.dart

@@ -1029,7 +1029,7 @@ abstract class Element implements BuildContext {
     assert(false);
   }
 
-  String debugGetOwnershipChain(int limit) {
+  String debugGetCreatorChain(int limit) {
     List<String> chain = <String>[];
     Element node = this;
     while (chain.length < limit && node != null) {
@@ -1512,7 +1512,7 @@ class ParentDataElement<T extends RenderObjectWidget> extends _ProxyElement {
         'Incorrect use of ParentDataWidget.\n' +
         widget.debugDescribeInvalidAncestorChain(
           description: "$this",
-          ownershipChain: parent.debugGetOwnershipChain(10),
+          ownershipChain: parent.debugGetCreatorChain(10),
           foundValidAncestor: ancestor != null,
           badAncestors: badAncestors
         )
@@ -1634,7 +1634,7 @@ abstract class RenderObjectElement extends BuildableElement {
   }
 
   void debugUpdateRenderObjectOwner() {
-    _renderObject.debugOwner = debugGetOwnershipChain(10);
+    _renderObject.debugCreator = debugGetCreatorChain(10);
   }
 
   @override