dart2js: Rename "current isolate" to "static state (holder)".

pkg/compiler/lib/src/js_emitter/program_builder/registry.dart

Index: pkg/compiler/lib/src/js_emitter/program_builder/registry.dart
diff --git a/pkg/compiler/lib/src/js_emitter/program_builder/registry.dart b/pkg/compiler/lib/src/js_emitter/program_builder/registry.dart
index ab7aa52df82234de648607d47f1745c13dc3261a..2fe3e12e8eafee84b312b5c7ed165a0cc8d869a6 100644
--- a/pkg/compiler/lib/src/js_emitter/program_builder/registry.dart
+++ b/pkg/compiler/lib/src/js_emitter/program_builder/registry.dart
@@ -113,9 +113,10 @@ class Registry {
     // Ignore for now.
   }
 
-  Holder registerHolder(String name) {
-    return _holdersMap.putIfAbsent(
-        name,
-        () => new Holder(name, _holdersMap.length));
+  Holder registerHolder(String name, {bool isStaticStateHolder: false}) {
+    return _holdersMap.putIfAbsent(name, () {
+      return new Holder(name, _holdersMap.length,
+          isStaticStateHolder: isStaticStateHolder);
+    });
   }
 }