dart2js: switching isolate is not 'PURE'

pkg/compiler/lib/src/native/behavior.dart

Index: pkg/compiler/lib/src/native/behavior.dart
diff --git a/pkg/compiler/lib/src/native/behavior.dart b/pkg/compiler/lib/src/native/behavior.dart
index 438dbe6d1797ecdcef10d0ae306075f3c9bfdcab..cd61a71db0337704f88e9ebcd90366a704cf1a2a 100644
--- a/pkg/compiler/lib/src/native/behavior.dart
+++ b/pkg/compiler/lib/src/native/behavior.dart
@@ -111,6 +111,9 @@ class NativeBehavior {
   static NativeBehavior get PURE => NativeBehavior._makePure();
   static NativeBehavior get PURE_ALLOCATION =>
       NativeBehavior._makePure(isAllocation: true);
+  static NativeBehavior get CHANGES_OTHER => NativeBehavior._makeChangesOther();
+  static NativeBehavior get DEPENDS_OTHER => NativeBehavior._makeDependsOther();
+
 
   String toString() {
     return 'NativeBehavior('
@@ -132,6 +135,18 @@ class NativeBehavior {
     return behavior;
   }
 
+  static NativeBehavior _makeChangesOther() {
+    // TODO(25544): Have a distinct effect instead of using static properties to
+    // model 'other' effects.
+    return _makePure()..sideEffects.setChangesStaticProperty();
+  }
+
+  static NativeBehavior _makeDependsOther() {
+    // TODO(25544): Have a distinct effect instead of using static properties to
+    // model 'other' effects.
+    return _makePure()..sideEffects.setDependsOnStaticPropertyStore();
+  }
+
   /// Processes the type specification string of a call to JS and stores the
   /// result in the [typesReturned] and [typesInstantiated]. It furthermore
   /// computes the side effects, and, if given, invokes [setSideEffects] with