More debugCheckHasMaterialLocalizations() asserts (#23740)

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

@@ -116,6 +116,7 @@ class CloseButton extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    assert(debugCheckHasMaterialLocalizations(context));
     return IconButton(
       icon: const Icon(Icons.close),
       tooltip: MaterialLocalizations.of(context).closeButtonTooltip,

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

@@ -943,7 +943,6 @@ class _DatePickerDialogState extends State<_DatePickerDialog> {
 
   @override
   Widget build(BuildContext context) {
-    assert(debugCheckHasMaterialLocalizations(context));
     final ThemeData theme = Theme.of(context);
     final Widget picker = Flexible(
       child: SizedBox(
@@ -1086,6 +1085,8 @@ Future<DateTime> showDatePicker({
     'Provided initialDate must satisfy provided selectableDayPredicate'
   );
   assert(initialDatePickerMode != null, 'initialDatePickerMode must not be null');
+  assert(context != null);
+  assert(debugCheckHasMaterialLocalizations(context));
 
   Widget child = _DatePickerDialog(
     initialDate: initialDate,

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

@@ -670,6 +670,7 @@ class _StepperState extends State<Stepper> with TickerProviderStateMixin {
   @override
   Widget build(BuildContext context) {
     assert(debugCheckHasMaterial(context));
+    assert(debugCheckHasMaterialLocalizations(context));
     assert(() {
       if (context.ancestorWidgetOfExactType(Stepper) != null)
         throw FlutterError(

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

@@ -899,6 +899,7 @@ class _TabBarState extends State<TabBar> {
 
   @override
   Widget build(BuildContext context) {
+    assert(debugCheckHasMaterialLocalizations(context));
     final MaterialLocalizations localizations = MaterialLocalizations.of(context);
     if (_controller.length == 0) {
       return Container(

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

@@ -7,6 +7,7 @@ import 'dart:math' as math;
 import 'package:flutter/widgets.dart';
 import 'package:flutter/rendering.dart';
 
+import 'debug.dart';
 import 'flat_button.dart';
 import 'material.dart';
 import 'material_localizations.dart';
@@ -132,6 +133,7 @@ class _MaterialTextSelectionControls extends TextSelectionControls {
   @override
   Widget buildToolbar(BuildContext context, Rect globalEditableRegion, Offset position, TextSelectionDelegate delegate) {
     assert(debugCheckHasMediaQuery(context));
+    assert(debugCheckHasMaterialLocalizations(context));
     return ConstrainedBox(
       constraints: BoxConstraints.tight(globalEditableRegion.size),
       child: CustomSingleChildLayout(

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

@@ -3,10 +3,13 @@
 // found in the LICENSE file.
 
 import 'dart:ui' show hashValues;
+
 import 'package:flutter/widgets.dart';
 
+import 'debug.dart';
 import 'material_localizations.dart';
 
+
 /// Whether the [TimeOfDay] is before or after noon.
 enum DayPeriod {
   /// Ante meridiem (before noon).
@@ -96,7 +99,8 @@ class TimeOfDay {
   ///
   /// This is a shortcut for [MaterialLocalizations.formatTimeOfDay].
   String format(BuildContext context) {
-    debugCheckHasMediaQuery(context);
+    assert(debugCheckHasMediaQuery(context));
+    assert(debugCheckHasMaterialLocalizations(context));
     final MaterialLocalizations localizations = MaterialLocalizations.of(context);
     return localizations.formatTimeOfDay(
       this,

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

@@ -12,6 +12,7 @@ import 'package:flutter/widgets.dart';
 import 'button_bar.dart';
 import 'button_theme.dart';
 import 'colors.dart';
+import 'debug.dart';
 import 'dialog.dart';
 import 'feedback.dart';
 import 'flat_button.dart';
@@ -1672,6 +1673,7 @@ Future<TimeOfDay> showTimePicker({
 }) async {
   assert(context != null);
   assert(initialTime != null);
+  assert(debugCheckHasMaterialLocalizations(context));
 
   return await showDialog<TimeOfDay>(
     context: context,