Rename OnPlatformViewCreated to PlatformViewCreatedCallback (#20189)

packages/flutter/lib/src/services/platform_views.dart

@@ -37,7 +37,7 @@ class PlatformViewsRegistry {
 /// Callback signature for when a platform view was created.
 ///
 /// `id` is the platform view's unique identifier.
-typedef void OnPlatformViewCreated(int id);
+typedef void PlatformViewCreatedCallback(int id);
 
 /// Provides access to the platform views service.
 ///
@@ -62,7 +62,7 @@ class PlatformViewsService {
   static AndroidViewController initAndroidView({
     @required int id,
     @required String viewType,
-    OnPlatformViewCreated onPlatformViewCreated,
+    PlatformViewCreatedCallback onPlatformViewCreated,
   }) {
     assert(id != null);
     assert(viewType != null);
@@ -328,7 +328,7 @@ class AndroidViewController {
   AndroidViewController._(
     this.id,
     String viewType,
-    OnPlatformViewCreated onPlatformViewCreated,
+    PlatformViewCreatedCallback onPlatformViewCreated,
   ) : assert(id != null),
       assert(viewType != null),
       _viewType = viewType,
@@ -370,7 +370,7 @@ class AndroidViewController {
 
   final String _viewType;
 
-  final OnPlatformViewCreated _onPlatformViewCreated;
+  final PlatformViewCreatedCallback _onPlatformViewCreated;
 
   /// The texture entry id into which the Android view is rendered.
   int _textureId;

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

@@ -57,7 +57,7 @@ class AndroidView extends StatefulWidget {
   /// Callback to invoke after the Android view has been created.
   ///
   /// May be null.
-  final OnPlatformViewCreated onPlatformViewCreated;
+  final PlatformViewCreatedCallback onPlatformViewCreated;
 
   @override
   State createState() => new _AndroidViewState();

packages/flutter/test/services/platform_views_test.dart

@@ -94,7 +94,7 @@ void main() {
     test('OnPlatformViewCreated callback', () async {
       viewsController.registerViewType('webview');
       final List<int> createdViews = <int>[];
-      final OnPlatformViewCreated callback = (int id) { createdViews.add(id); };
+      final PlatformViewCreatedCallback callback = (int id) { createdViews.add(id); };
 
       final AndroidViewController controller1 = PlatformViewsService.initAndroidView(
           id: 0, viewType: 'webview', onPlatformViewCreated:  callback);