[flutter_tools] do not crash if shared profile restoration fails (#75718)

packages/flutter_tools/lib/src/web/chrome.dart

@@ -344,9 +344,13 @@ class ChromiumLauncher {
     final Directory sourceChromeDefault = _fileSystem.directory(_fileSystem.path.join(cacheDir.path ?? '', _chromeDefaultPath));
     final Directory targetChromeDefault = _fileSystem.directory(_fileSystem.path.join(userDataDir.path, _chromeDefaultPath));
 
-    if (sourceChromeDefault.existsSync()) {
-      targetChromeDefault.createSync(recursive: true);
-      _fileSystemUtils.copyDirectorySync(sourceChromeDefault, targetChromeDefault);
+    try {
+      if (sourceChromeDefault.existsSync()) {
+        targetChromeDefault.createSync(recursive: true);
+        _fileSystemUtils.copyDirectorySync(sourceChromeDefault, targetChromeDefault);
+      }
+    } on FileSystemException catch (err) {
+      _logger.printError('Failed to restore Chrome preferences: $err');
     }
   }
 

packages/flutter_tools/test/general.shard/web/chrome_test.dart

@@ -13,7 +13,6 @@ import 'package:flutter_tools/src/base/os.dart';
 import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/web/chrome.dart';
 import 'package:mockito/mockito.dart';
-
 import '../../src/common.dart';
 import '../../src/context.dart';
 
@@ -143,6 +142,46 @@ void main() {
     expect(logger.errorText, contains('Failed to save Chrome preferences'));
   });
 
+  testWithoutContext('does not crash if restoring profile information fails due to a file system exception.', () async {
+    final MockFileSystemUtils fileSystemUtils = MockFileSystemUtils();
+    final BufferLogger logger = BufferLogger.test();
+    chromeLauncher = ChromiumLauncher(
+      fileSystem: fileSystem,
+      platform: platform,
+      processManager: processManager,
+      operatingSystemUtils: operatingSystemUtils,
+      browserFinder: findChromeExecutable,
+      logger: logger,
+      fileSystemUtils: fileSystemUtils,
+    );
+    when(fileSystemUtils.copyDirectorySync(any, any))
+      .thenThrow(const FileSystemException());
+    processManager.addCommand(const FakeCommand(
+      command: <String>[
+        'example_chrome',
+        '--user-data-dir=/.tmp_rand0/flutter_tools_chrome_device.rand0',
+        '--remote-debugging-port=1234',
+        ...kChromeArgs,
+        'example_url',
+      ],
+      stderr: kDevtoolsStderr,
+    ));
+
+    fileSystem.currentDirectory.childDirectory('Default').createSync();
+    final Chromium chrome = await chromeLauncher.launch(
+      'example_url',
+      skipCheck: true,
+      cacheDir: fileSystem.currentDirectory,
+    );
+
+    // Create cache dir that the Chrome launcher will atttempt to persist.
+    fileSystem.directory('/.tmp_rand0/flutter_tools_chrome_device.rand0/Default/Local Storage')
+      .createSync(recursive: true);
+
+    await chrome.close(); // does not exit with error.
+    expect(logger.errorText, contains('Failed to restore Chrome preferences'));
+  });
+
   testWithoutContext('can launch chrome with a custom debug port', () async {
     processManager.addCommand(const FakeCommand(
       command: <String>[