Launch Chrome natively on ARM macOS (#80758)

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

@@ -218,7 +218,7 @@ class ChromiumLauncher {
       url,
     ];
 
-    final Process? process = await _spawnChromiumProcess(args);
+    final Process? process = await _spawnChromiumProcess(args, chromeExecutable);
 
     // When the process exits, copy the user settings back to the provided data-dir.
     if (process != null && cacheDir != null) {
@@ -235,7 +235,18 @@ class ChromiumLauncher {
     ), skipCheck);
   }
 
-  Future<Process?> _spawnChromiumProcess(List<String> args) async {
+  Future<Process?> _spawnChromiumProcess(List<String> args, String chromeExecutable) async {
+    if (_operatingSystemUtils.hostPlatform == HostPlatform.darwin_arm) {
+      final ProcessResult result = _processManager.runSync(<String>['file', chromeExecutable]);
+      // Check if ARM Chrome is installed.
+      // Mach-O 64-bit executable arm64
+      if ((result.stdout as String).contains('arm64')) {
+        _logger.printTrace('Found ARM Chrome installation at $chromeExecutable, forcing native launch.');
+        // If so, force Chrome to launch natively.
+        args.insertAll(0, <String>['/usr/bin/arch', '-arm64']);
+      }
+    }
+
     // Keep attempting to launch the browser until one of:
     // - Chrome launched successfully, in which case we just return from the loop.
     // - The tool detected an unretriable Chrome error, in which case we throw ToolExit.

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

@@ -189,6 +189,121 @@ void main() {
     expect(logger.errorText, contains('Failed to restore Chrome preferences'));
   });
 
+  testWithoutContext('can launch Chrome on x86_64 macOS', () async {
+    final OperatingSystemUtils macOSUtils = FakeOperatingSystemUtils(hostPlatform: HostPlatform.darwin_x64);
+    final ChromiumLauncher chromiumLauncher = ChromiumLauncher(
+      fileSystem: fileSystem,
+      platform: platform,
+      processManager: processManager,
+      operatingSystemUtils: macOSUtils,
+      browserFinder: findChromeExecutable,
+      logger: BufferLogger.test(),
+    );
+
+    processManager.addCommands(<FakeCommand>[
+      const FakeCommand(
+        command: <String>[
+          'example_chrome',
+          '--user-data-dir=/.tmp_rand0/flutter_tools_chrome_device.rand0',
+          '--remote-debugging-port=12345',
+          ...kChromeArgs,
+          'example_url',
+        ],
+        stderr: kDevtoolsStderr,
+      )
+    ]);
+
+    expect(
+          () async => chromiumLauncher.launch(
+        'example_url',
+        skipCheck: true,
+      ),
+      returnsNormally,
+    );
+  });
+
+  testWithoutContext('can launch x86_64 Chrome on ARM macOS', () async {
+    final OperatingSystemUtils macOSUtils = FakeOperatingSystemUtils(hostPlatform: HostPlatform.darwin_arm);
+    final ChromiumLauncher chromiumLauncher = ChromiumLauncher(
+      fileSystem: fileSystem,
+      platform: platform,
+      processManager: processManager,
+      operatingSystemUtils: macOSUtils,
+      browserFinder: findChromeExecutable,
+      logger: BufferLogger.test(),
+    );
+
+    processManager.addCommands(<FakeCommand>[
+      const FakeCommand(
+        command: <String>[
+          'file',
+          'example_chrome',
+        ],
+        stdout: 'Mach-O 64-bit executable x86_64',
+      ),
+      const FakeCommand(
+        command: <String>[
+          'example_chrome',
+          '--user-data-dir=/.tmp_rand0/flutter_tools_chrome_device.rand0',
+          '--remote-debugging-port=12345',
+          ...kChromeArgs,
+          'example_url',
+        ],
+        stderr: kDevtoolsStderr,
+      )
+    ]);
+
+    expect(
+          () async => chromiumLauncher.launch(
+        'example_url',
+        skipCheck: true,
+      ),
+      returnsNormally,
+    );
+  });
+
+  testWithoutContext('can launch ARM Chrome natively on ARM macOS when installed', () async {
+    final OperatingSystemUtils macOSUtils = FakeOperatingSystemUtils(hostPlatform: HostPlatform.darwin_arm);
+    final ChromiumLauncher chromiumLauncher = ChromiumLauncher(
+      fileSystem: fileSystem,
+      platform: platform,
+      processManager: processManager,
+      operatingSystemUtils: macOSUtils,
+      browserFinder: findChromeExecutable,
+      logger: BufferLogger.test(),
+    );
+
+    processManager.addCommands(<FakeCommand>[
+      const FakeCommand(
+        command: <String>[
+          'file',
+          'example_chrome',
+        ],
+        stdout: 'Mach-O 64-bit executable arm64',
+      ),
+      const FakeCommand(
+        command: <String>[
+          '/usr/bin/arch',
+          '-arm64',
+          'example_chrome',
+          '--user-data-dir=/.tmp_rand0/flutter_tools_chrome_device.rand0',
+          '--remote-debugging-port=12345',
+          ...kChromeArgs,
+          'example_url',
+        ],
+        stderr: kDevtoolsStderr,
+      ),
+    ]);
+
+    expect(
+      () async => chromiumLauncher.launch(
+        'example_url',
+        skipCheck: true,
+      ),
+      returnsNormally,
+    );
+  });
+
   testWithoutContext('can launch chrome with a custom debug port', () async {
     processManager.addCommand(const FakeCommand(
       command: <String>[

packages/flutter_tools/test/src/context.dart

@@ -296,6 +296,8 @@ class MockSimControl extends Mock implements SimControl {
 }
 
 class FakeOperatingSystemUtils implements OperatingSystemUtils {
+  FakeOperatingSystemUtils({this.hostPlatform = HostPlatform.linux_x64});
+
   @override
   ProcessResult makeExecutable(File file) => null;