Update engine (#9484)

bin/internal/engine.version

-2a4434a058d0243447483101160c833029cb3654
+fd286ae4455a84ae37f7e7207089cf1671b8b6bd

dev/tools/dartdoc.dart

@@ -113,8 +113,8 @@ void createFooter(String footerPath) {
 void sanityCheckDocs() {
   final List<String> canaries = <String>[
     '$kDocRoot/api/dart.io/File-class.html',
-    '$kDocRoot/api/dart_ui/Canvas-class.html',
-    '$kDocRoot/api/dart_ui/Canvas/drawRect.html',
+    '$kDocRoot/api/dart.ui/Canvas-class.html',
+    '$kDocRoot/api/dart.ui/Canvas/drawRect.html',
     '$kDocRoot/api/flutter_test/WidgetTester/pumpWidget.html',
     '$kDocRoot/api/material/Material-class.html',
     '$kDocRoot/api/material/Tooltip-class.html',

packages/flutter_tools/lib/src/commands/build_aot.dart

@@ -78,7 +78,7 @@ class BuildAotCommand extends BuildSubCommand {
   }
 }
 
-String _getSdkExtensionPath(PackageMap packageMap, String package) {
+String _getPackagePath(PackageMap packageMap, String package) {
   return fs.path.dirname(packageMap.map[package].toFilePath());
 }
 
@@ -145,8 +145,8 @@ Future<String> _buildAotSnapshot(
     return null;
   }
 
-  final String skyEnginePkg = _getSdkExtensionPath(packageMap, 'sky_engine');
-  final String uiPath = fs.path.join(skyEnginePkg, 'dart_ui', 'ui.dart');
+  final String skyEnginePkg = _getPackagePath(packageMap, 'sky_engine');
+  final String uiPath = fs.path.join(skyEnginePkg, 'lib', 'ui', 'ui.dart');
   final String vmServicePath = fs.path.join(skyEnginePkg, 'sdk_ext', 'vmservice_io.dart');
 
   final List<String> filePaths = <String>[