Heap snapshot visualizations

runtime/observatory/lib/src/app/page.dart

Index: runtime/observatory/lib/src/app/page.dart
diff --git a/runtime/observatory/lib/src/app/page.dart b/runtime/observatory/lib/src/app/page.dart
index 6a99c3223bf2ff2f4b6f2836fe09b42743d60b7f..ba213f7050ea026087cdfedc6ab748ce0728ce52 100644
--- a/runtime/observatory/lib/src/app/page.dart
+++ b/runtime/observatory/lib/src/app/page.dart
@@ -264,6 +264,21 @@ class HeapMapPage extends SimplePage {
   }
 }
 
+class HeapSnapshotPage extends SimplePage {
+  HeapSnapshotPage(app) : super('heap-snapshot', 'heap-snapshot', app);
+
+  void _visit(Uri uri) {
+    super._visit(uri);
+    getIsolate(uri).then((isolate) {
+      if (element != null) {
+        /// Update the page.
+        HeapSnapshotElement page = element;
+        page.isolate = isolate;
+      }
+    });
+  }
+}
+
 class ErrorViewPage extends Page {
   ErrorViewPage(app) : super(app);