Add view for MegamorphicCache. Update view for ObjectPool.

runtime/observatory/lib/src/elements/service_view.dart

Index: runtime/observatory/lib/src/elements/service_view.dart
diff --git a/runtime/observatory/lib/src/elements/service_view.dart b/runtime/observatory/lib/src/elements/service_view.dart
index 26ffd364a6d90ce02f35bf52d812e7df5f12e44f..c9924a6de22fa8601c6d049451e95f8c41e57959 100644
--- a/runtime/observatory/lib/src/elements/service_view.dart
+++ b/runtime/observatory/lib/src/elements/service_view.dart
@@ -89,6 +89,11 @@ class ServiceObjectViewElement extends ObservatoryElement {
                   new Element.tag('instructions-view');
               element.instructions = object;
               return element;
+            case 'MegamorphicCache':
+              MegamorphicCacheViewElement element =
+                  new Element.tag('megamorphiccache-view');
+              element.megamorphicCache = object;
+              return element;
             case 'ObjectPool':
               ObjectPoolViewElement element = new Element.tag('objectpool-view');
               element.pool = object;