Invoke Device::startApp on the specific device

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

@@ -9,6 +9,7 @@ import 'package:path/path.dart' as path;
 
 import '../application_package.dart';
 import '../base/logging.dart';
+import '../build_configuration.dart';
 import '../device.dart';
 import '../runner/flutter_command.dart';
 import 'build.dart';
@@ -84,6 +85,8 @@ abstract class StartCommandBase extends FlutterCommand {
         continue;
 
       logging.fine('Running build command for $device.');
+
+      if (device.platform == TargetPlatform.android) {
         BuildCommand builder = new BuildCommand();
         builder.inheritFromParent(this);
         await builder.buildInTempDir(
@@ -100,6 +103,13 @@ abstract class StartCommandBase extends FlutterCommand {
                 startedSomething = true;
             }
         );
+      } else {
+        bool result = await device.startApp(package);
+        if (!result) {
+          logging.severe('Could not start \'${package.name}\' on \'${device.id}\'');
+          continue;
+        }
+      }
     }
 
     if (!startedSomething) {