Rename 'astep' to 'anext' to better reflect its semantics.

runtime/observatory/lib/src/elements/debugger.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library debugger_page_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/cli.dart';
@@ skipping 331 matching lines @@
   String helpShort =
       'Continue running the isolate until it reaches the next source location';
 
   String helpLong =
       'Continue running the isolate until it reaches the next source '
       'location.\n'
       '\n'
       'Syntax: step\n';
 }
 
-class AsyncStepCommand extends DebuggerCommand {
-  AsyncStepCommand(Debugger debugger) : super(debugger, 'astep', []) {
+class AsyncNextCommand extends DebuggerCommand {
+  AsyncNextCommand(Debugger debugger) : super(debugger, 'anext', []) {
   }
 
   Future run(List<String> args) async {
     if (debugger.isolatePaused()) {
       var event = debugger.isolate.pauseEvent;
       if (event.asyncContinuation == null) {
         debugger.console.print("No async continuation at this location");
         return;
       }
       var bpt = await
           debugger.isolate.addBreakOnActivation(event.asyncContinuation);
       return debugger.isolate.resume();
     } else {
       debugger.console.print('The program is already running');
     }
   }
 
   String helpShort =
-      'Step into asynchronous continuation';
+      'Step over await or yield';
 
   String helpLong =
       'Continue running the isolate until control returns to the current '
       'activation of an async or async* function.\n'
       '\n'
-      'Syntax: astep\n';
+      'Syntax: anext\n';
 }
 
 class FinishCommand extends DebuggerCommand {
   FinishCommand(Debugger debugger) : super(debugger, 'finish', []);
 
   Future run(List<String> args) {
     if (debugger.isolatePaused()) {
       return debugger.isolate.stepOut();
     } else {
       debugger.console.print('The program is already running');
@@ skipping 583 matching lines @@
     cmd = new RootCommand([
         new HelpCommand(this),
         new PrintCommand(this),
         new DownCommand(this),
         new UpCommand(this),
         new FrameCommand(this),
         new PauseCommand(this),
         new ContinueCommand(this),
         new NextCommand(this),
         new StepCommand(this),
-        new AsyncStepCommand(this),
+        new AsyncNextCommand(this),
         new FinishCommand(this),
         new BreakCommand(this),
         new SetCommand(this),
         new ClearCommand(this),
         new DeleteCommand(this),
         new InfoCommand(this),
         new IsolateCommand(this),
         new RefreshCommand(this),
     ]);
     _stdioPrinter = new _VMStreamPrinter(this);
@@ skipping 891 matching lines @@
       });
   }
 
   void focus() {
     $['textBox'].focus();
   }
 
   DebuggerInputElement.created() : super.created();
 }