Clean up the patch file for the isolate library by introducing a new builtin library: isolate_helpe…

runtime/lib/isolate_patch.dart

Index: runtime/lib/isolate_patch.dart
===================================================================
--- runtime/lib/isolate_patch.dart	(revision 16024)
+++ runtime/lib/isolate_patch.dart	(working copy)
@@ -128,27 +128,27 @@
 patch spawnUri(String uri) native "isolate_spawnUri";
 
 patch class Timer {
-  /* patch */ factory Timer(int milliSeconds, void callback(Timer timer)) {
+  /* patch */ factory Timer(int milliseconds, void callback(Timer timer)) {
     if (_TimerFactory._factory == null) {
       throw new UnsupportedError("Timer interface not supported.");
     }
-    return _TimerFactory._factory(milliSeconds, callback, false);
+    return _TimerFactory._factory(milliseconds, callback, false);
   }
 
   /**
    * Creates a new repeating timer. The [callback] is invoked every
-   * [milliSeconds] millisecond until cancelled.
+   * [milliseconds] millisecond until cancelled.
    */
-  /* patch */ factory Timer.repeating(int milliSeconds,
+  /* patch */ factory Timer.repeating(int milliseconds,
                                       void callback(Timer timer)) {
     if (_TimerFactory._factory == null) {
       throw new UnsupportedError("Timer interface not supported.");
     }
-    return _TimerFactory._factory(milliSeconds, callback, true);
+    return _TimerFactory._factory(milliseconds, callback, true);
   }
 }
 
-typedef Timer _TimerFactoryClosure(int milliSeconds,
+typedef Timer _TimerFactoryClosure(int milliseconds,
                                    void callback(Timer timer),
                                    bool repeating);