Add browser launching functionality.

tools/testing/dart/launch_browser.dart

+// Copyright (c) 2013, 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.
+
+/**
+ * Simple command line interface to launcing browsers.
+ * Uses the browser_controller framework.
+ * The usage is:
+ *   DARTBIN launch_browser.dart BROWSER_NAME URL

[kustermann, 2013/05/29 11:02:34]

You could add a comment that DARTBIN should be the checked-in one.

[ricow1, 2013/05/29 11:46:31]

Done.

+ */
+
+import "dart:io";
+import "browser_controller.dart";
+
+const List<String> SUPPORTED_BROWSERS = 
+  const ['safari', 'ff', 'chrome'];

[kustermann, 2013/05/29 11:02:34]

Please add a TODO for me to make this work with android/iOS as well.
In addition to that: Since you already have created a 'Browser.byName'
constructor, you could also move the 'supportedBrowser()' function to a static
'Browser.isSupported()'.

[ricow1, 2013/05/29 11:46:31]

Done.

+
+bool supportedBrowser(String browser) {
+  return SUPPORTED_BROWSERS.contains(browser);
+}
+
+void printHelp() {
+  print("""
+Usage pattern:
+launch_browser browser url
+Supported browsers: $SUPPORTED_BROWSERS
+""");

[kustermann, 2013/05/29 11:02:34]

If you use three strings, you can indent then correct.

[ricow1, 2013/05/29 11:46:31]

Done.

+}
+
+void main() {
+  var args = new Options().arguments;
+  if (args.length != 2) {
+    print("Wrong number of arguments, please pass in exactly two arguments");
+    printHelp();
+    return;
+  }
+  if (!supportedBrowser(args[0])) {
+    print("Specified browser not supported");
+    printHelp();
+    return;
+  }
+  var browser = new Browser.byName(args[0]);
+  browser.start(args[1]);
+
+}