Fix `DrawerHeader` decoration not inheriting `ColorScheme.primary` (#101280)

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

@@ -369,9 +369,7 @@ class _UserAccountsDrawerHeaderState extends State<UserAccountsDrawerHeader> {
       container: true,
       label: MaterialLocalizations.of(context).signedInLabel,
       child: DrawerHeader(
-        decoration: widget.decoration ?? BoxDecoration(
-          color: Theme.of(context).primaryColor,
-        ),
+        decoration: widget.decoration ?? BoxDecoration(color: Theme.of(context).colorScheme.primary),
         margin: widget.margin,
         padding: const EdgeInsetsDirectional.only(top: 16.0, start: 16.0),
         child: SafeArea(

packages/flutter/test/material/user_accounts_drawer_header_test.dart

@@ -19,9 +19,15 @@ Future<void> pumpTestWidget(
       bool withOnDetailsPressedHandler = true,
       Size otherAccountsPictureSize = const Size.square(40.0),
       Size currentAccountPictureSize  = const Size.square(72.0),
+      Color? primaryColor,
+      Color? colorSchemePrimary,
     }) async {
   await tester.pumpWidget(
     MaterialApp(
+      theme: ThemeData(
+        primaryColor: primaryColor,
+        colorScheme: const ColorScheme.light().copyWith(primary: colorSchemePrimary),
+      ),
       home: MediaQuery(
         data: const MediaQueryData(
           padding: EdgeInsets.only(
@@ -76,6 +82,19 @@ void main() {
     matching: find.byType(Transform),
   );
 
+  testWidgets('UserAccountsDrawerHeader inherits ColorScheme.primary', (WidgetTester tester) async {
+    const Color primaryColor = Color(0xff00ff00);
+    const Color colorSchemePrimary = Color(0xff0000ff);
+
+    await pumpTestWidget(tester, primaryColor: primaryColor, colorSchemePrimary: colorSchemePrimary);
+
+    final BoxDecoration? boxDecoration = tester.widget<DrawerHeader>(
+      find.byType(DrawerHeader),
+    ).decoration as BoxDecoration?;
+    expect(boxDecoration?.color == primaryColor, false);
+    expect(boxDecoration?.color == colorSchemePrimary, true);
+  });
+
   testWidgets('UserAccountsDrawerHeader test', (WidgetTester tester) async {
     await pumpTestWidget(tester);