Added page to Observatory to display native memory allocation information.

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 e5fc6daee8af78d2f0232a783317505c8a1abce5..5819bb2469b3d512504a96c860fcdfbfe936d9ca 100644
--- a/runtime/observatory/lib/src/app/page.dart
+++ b/runtime/observatory/lib/src/app/page.dart
@@ -21,6 +21,8 @@ final _isolateSampleProfileRepository = new IsolateSampleProfileRepository();
 final _libraryRepository = new LibraryRepository();
 final _megamorphicCacheRepository = new MegamorphicCacheRepository();
 final _metricRepository = new MetricRepository();
+final _nativeMemorySampleProfileRepository = new
+            NativeMemorySampleProfileRepository();
 final _objectRepository = new ObjectRepository();
 final _objectPoolRepository = new ObjectPoolRepository();
 final _objectstoreRepository = new ObjectStoreRepository();
@@ -187,6 +189,24 @@ class FlagsPage extends SimplePage {
   }
 }
 
+class NativeMemoryProfilerPage extends SimplePage {
+  NativeMemoryProfilerPage(app) : super('native-memory-profile',
+                                        'native-memory-profile', app);
+  @override
+  onInstall() {
+    if (element == null) {
+      element = new NativeMemoryProfileElement(app.vm, app.events,
+        app.notifications, _nativeMemorySampleProfileRepository,
+        queue: app.queue);
+    }
+    assert(element != null);
+  }
+
+  void _visit(Uri uri) {
+    super._visit(uri);
+  }
+}
+
 class InspectPage extends MatchingPage {
   InspectPage(app) : super('inspect', app);