Add ObjectPool tag for external labels. Use LoadExternalLabel for native calls...

runtime/observatory/lib/src/elements/objectpool_view.html

Index: runtime/observatory/lib/src/elements/objectpool_view.html
diff --git a/runtime/observatory/lib/src/elements/objectpool_view.html b/runtime/observatory/lib/src/elements/objectpool_view.html
index a92853186f0da213f0f7494c1cb4a1d337a05bd9..d358fea69bc43c5bdf48b469e4596a27c40ed465 100644
--- a/runtime/observatory/lib/src/elements/objectpool_view.html
+++ b/runtime/observatory/lib/src/elements/objectpool_view.html
@@ -37,7 +37,7 @@
                 </any-service-ref>
               </template>
               <template if="{{ !isServiceObject(pool.entries[index]) }}">
-                0x{{ pool.entries[index].toRadixString(16) }}
+                {{ pool.entries[index] }}
                 <template if="{{ annotatedEntries != null && annotatedEntries[index] != null }}">
                   (<any-service-ref ref="{{ annotatedEntries[index] }}"></any-service-ref>)
                 </template>