add identifiers to progress messages (#6868)

packages/flutter_tools/lib/src/base/logger.dart

@@ -33,7 +33,10 @@ abstract class Logger {
   void printTrace(String message);
 
   /// Start an indeterminate progress display.
-  Status startProgress(String message);
+  ///
+  /// [message] is the message to display to the user; [progressId] provides an ID which can be
+  /// used to identify this type of progress (`hot.reload`, `hot.restart`, ...).
+  Status startProgress(String message, { String progressId });
 }
 
 class Status {
@@ -76,7 +79,7 @@ class StdoutLogger extends Logger {
   void printTrace(String message) { }
 
   @override
-  Status startProgress(String message) {
+  Status startProgress(String message, { String progressId }) {
     if (_status != null) {
       // Ignore nested progresses; return a no-op status object.
       return new Status();
@@ -119,7 +122,7 @@ class BufferLogger extends Logger {
   void printTrace(String message) => _trace.writeln(message);
 
   @override
-  Status startProgress(String message) {
+  Status startProgress(String message, { String progressId }) {
     printStatus(message);
     return new Status();
   }
@@ -151,7 +154,7 @@ class VerboseLogger extends Logger {
   }
 
   @override
-  Status startProgress(String message) {
+  Status startProgress(String message, { String progressId }) {
     printStatus(message);
     return new Status();
   }

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

@@ -637,7 +637,7 @@ class NotifyingLogger extends Logger {
   }
 
   @override
-  Status startProgress(String message) {
+  Status startProgress(String message, { String progressId }) {
     printStatus(message);
     return new Status();
   }
@@ -711,7 +711,7 @@ class _AppRunLogger extends Logger {
   Status _status;
 
   @override
-  Status startProgress(String message) {
+  Status startProgress(String message, { String progressId }) {
     // Ignore nested progresses; return a no-op status object.
     if (_status != null)
       return new Status();
@@ -720,10 +720,11 @@ class _AppRunLogger extends Logger {
 
     _sendProgressEvent(<String, dynamic>{
       'id': id.toString(),
+      'progressId': progressId,
       'message': message,
     });
 
-    _status = new _AppLoggerStatus(this, id);
+    _status = new _AppLoggerStatus(this, id, progressId);
     return _status;
   }
 
@@ -747,10 +748,11 @@ class _AppRunLogger extends Logger {
 }
 
 class _AppLoggerStatus implements Status {
-  _AppLoggerStatus(this.logger, this.id);
+  _AppLoggerStatus(this.logger, this.id, this.progressId);
 
   final _AppRunLogger logger;
   final int id;
+  final String progressId;
 
   @override
   void stop({ bool showElapsedTime: true }) {
@@ -767,6 +769,7 @@ class _AppLoggerStatus implements Status {
   void _sendFinished() {
     logger._sendProgressEvent(<String, dynamic>{
       'id': id.toString(),
+      'progressId': progressId,
       'finished': true
     });
   }

packages/flutter_tools/lib/src/hot.dart

@@ -468,7 +468,7 @@ class HotRunner extends ResidentRunner {
   @override
   Future<OperationResult> restart({ bool fullRestart: false, bool pauseAfterRestart: false }) async {
     if (fullRestart) {
-      Status status = logger.startProgress('Performing full restart...');
+      Status status = logger.startProgress('Performing full restart...', progressId: 'hot.restart');
       try {
         await _restartFromSources();
         status.stop();
@@ -479,7 +479,7 @@ class HotRunner extends ResidentRunner {
         rethrow;
       }
     } else {
-      Status status = logger.startProgress('Performing hot reload...');
+      Status status = logger.startProgress('Performing hot reload...', progressId: 'hot.reload');
       try {
         OperationResult result = await _reloadSources(pause: pauseAfterRestart);
         status.stop();