Heap snapshot visualizations

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of app;
 
 class IsolateNotFound implements Exception {
   String isolateId;
   IsolateNotFound(this.isolateId);
   String toString() => "IsolateNotFound: $isolateId";
@@ skipping 246 matching lines @@
     getIsolate(uri).then((isolate) {
       if (element != null) {
         /// Update the page.
         HeapMapElement page = element;
         page.isolate = isolate;
       }
     });
   }
 }
 
+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);
 
   void onInstall() {
     if (element == null) {
       /// Lazily create page.
       element = new Element.tag('service-view');
     }
   }
 
@@ skipping 95 matching lines @@
   void _visit(Uri uri) {
     assert(element != null);
     assert(canVisit(uri));
     app.vm.getIsolate(uri.queryParameters['isolateId']).then((i) {
       (element as MetricsPageElement).isolate = i;
     });
   }
 
   bool canVisit(Uri uri) => uri.path == 'metrics';
 }