Support route (#4470)

* support --route in flutter run --resident

* also for the daemon app.start command

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

@@ -285,8 +285,7 @@ class AppDomain extends Domain {
     String deviceId = _getStringArg(args, 'deviceId', required: true);
     String projectDirectory = _getStringArg(args, 'projectDirectory', required: true);
     bool startPaused = _getBoolArg(args, 'startPaused');
-    // TODO(devoncarew): Use the route param.
+    String route = _getStringArg(args, 'route');
-    String route = _getStringArg(args, 'route'); // ignore: unused_local_variable
     String mode = _getStringArg(args, 'mode');
     String target = _getStringArg(args, 'target');
 
@@ -340,7 +339,7 @@ class AppDomain extends Domain {
     }
 
     app._runInZone(this, () {
-      runner.run(observatoryPortCompleter: observatoryPortCompleter).then((_) {
+      runner.run(observatoryPortCompleter: observatoryPortCompleter, route: route).then((_) {
         _sendAppEvent(app, 'stop');
       }).catchError((dynamic error) {
         _sendAppEvent(app, 'stop', <String, dynamic>{ 'error' : error.toString() });

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

@@ -116,7 +116,11 @@ class RunCommand extends RunCommandBase {
         debuggingOptions: options
       );
 
-      return runner.run(traceStartup: traceStartup, benchmark: argResults['benchmark']);
+      return runner.run(
+        traceStartup: traceStartup,
+        benchmark: argResults['benchmark'],
+        route: route
+      );
     } else {
       // TODO(devoncarew): Remove this path and support the `--no-resident` option
       // using the `RunAndStayResident` class.

packages/flutter_tools/lib/src/run.dart

@@ -56,14 +56,16 @@ class RunAndStayResident {
   Future<int> run({
     bool traceStartup: false,
     bool benchmark: false,
-    Completer<int> observatoryPortCompleter
+    Completer<int> observatoryPortCompleter,
+    String route
   }) {
     // Don't let uncaught errors kill the process.
     return runZoned(() {
       return _run(
         traceStartup: traceStartup,
         benchmark: benchmark,
-        observatoryPortCompleter: observatoryPortCompleter
+        observatoryPortCompleter: observatoryPortCompleter,
+        route: route
       );
     }, onError: (dynamic error, StackTrace stackTrace) {
       printError('Exception from flutter run: $error', stackTrace);
@@ -107,7 +109,8 @@ class RunAndStayResident {
   Future<int> _run({
     bool traceStartup: false,
     bool benchmark: false,
-    Completer<int> observatoryPortCompleter
+    Completer<int> observatoryPortCompleter,
+    String route
   }) async {
     _mainPath = findMainDartFile(target);
     if (!FileSystemEntity.isFileSync(_mainPath)) {
@@ -178,7 +181,8 @@ class RunAndStayResident {
       debuggingOptions.buildMode,
       mainPath: _mainPath,
       debuggingOptions: debuggingOptions,
-      platformArgs: platformArgs
+      platformArgs: platformArgs,
+      route: route
     );
 
     if (!_result.started) {