Return process from start() (dart-lang/browser_launcher#12)

pkgs/browser_launcher/lib/src/chrome.dart

diff --git a/pkgs/browser_launcher/lib/src/chrome.dart b/pkgs/browser_launcher/lib/src/chrome.dart
index c1c4084..6bc975e 100644
--- a/pkgs/browser_launcher/lib/src/chrome.dart
+++ b/pkgs/browser_launcher/lib/src/chrome.dart
@@ -113,11 +113,11 @@
   /// Starts Chrome with the given arguments.
   ///
   /// Each url in [urls] will be loaded in a separate tab.
-  static Future<void> start(
+  static Future<Process> start(
     List<String> urls, {
     List<String> args = const [],
   }) async {
-    await _startProcess(urls, args: args);
+    return await _startProcess(urls, args: args);
   }
 
   static Future<Process> _startProcess(