Fixed missing method referenced when MallocHooks is unsupported.

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

Index: runtime/observatory/lib/src/elements/native_memory_profiler.dart
diff --git a/runtime/observatory/lib/src/elements/native_memory_profiler.dart b/runtime/observatory/lib/src/elements/native_memory_profiler.dart
new file mode 100644
index 0000000000000000000000000000000000000000..688f4fd9928b54e006b0ce00d79aecc7ff1eb712
--- /dev/null
+++ b/runtime/observatory/lib/src/elements/native_memory_profiler.dart
@@ -0,0 +1,162 @@
+// Copyright (c) 2013, 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.
+
+library native_memory_profile;
+
+import 'dart:async';
+import 'dart:html';
+import 'package:observatory/models.dart' as M;
+import 'package:observatory/src/elements/cpu_profile/virtual_tree.dart';
+import 'package:observatory/src/elements/helpers/nav_bar.dart';
+import 'package:observatory/src/elements/helpers/nav_menu.dart';
+import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/helpers/uris.dart';
+import 'package:observatory/src/elements/nav/notify.dart';
+import 'package:observatory/src/elements/nav/refresh.dart';
+import 'package:observatory/src/elements/nav/top_menu.dart';
+import 'package:observatory/src/elements/nav/vm_menu.dart';
+import 'package:observatory/src/elements/sample_buffer_control.dart';
+import 'package:observatory/src/elements/stack_trace_tree_config.dart';
+
+class NativeMemoryProfileElement extends HtmlElement implements Renderable {
+  static const tag = const Tag<NativeMemoryProfileElement>(
+      'native-memory-profile',
+      dependencies: const [
+        NavTopMenuElement.tag,
+        NavVMMenuElement.tag,
+        NavRefreshElement.tag,
+        NavNotifyElement.tag,
+        SampleBufferControlElement.tag,
+        StackTraceTreeConfigElement.tag,
+        CpuProfileVirtualTreeElement.tag,
+      ]);
+
+  RenderingScheduler<NativeMemoryProfileElement> _r;
+
+  Stream<RenderedEvent<NativeMemoryProfileElement>> get onRendered =>
+      _r.onRendered;
+
+  M.VM _vm;
+  M.EventRepository _events;
+  M.NotificationRepository _notifications;
+  M.NativeMemorySampleProfileRepository _profiles;
+  Stream<M.SampleProfileLoadingProgressEvent> _progressStream;
+  M.SampleProfileLoadingProgress _progress;
+  M.SampleProfileTag _tag = M.SampleProfileTag.none;
+  ProfileTreeMode _mode = ProfileTreeMode.function;
+  M.ProfileTreeDirection _direction = M.ProfileTreeDirection.exclusive;
+  String _filter = '';
+
+  M.NotificationRepository get notifications => _notifications;
+  M.NativeMemorySampleProfileRepository get profiles => _profiles;
+  // With non-isolate version.
+  M.VMRef get vm => _vm;
+
+  factory NativeMemoryProfileElement(
+      M.VM vm,
+      M.EventRepository events,
+      M.NotificationRepository notifications,
+      M.NativeMemorySampleProfileRepository profiles,
+      {RenderingQueue queue}) {
+    assert(vm != null);
+    assert(events != null);
+    assert(notifications != null);
+    assert(profiles != null);
+    NativeMemoryProfileElement e = document.createElement(tag.name);
+    e._r = new RenderingScheduler(e, queue: queue);
+    e._vm = vm;
+    e._events = events;
+    e._notifications = notifications;
+    e._profiles = profiles;
+    return e;
+  }
+
+  NativeMemoryProfileElement.created() : super.created();
+
+  @override
+  attached() {
+    super.attached();
+    _r.enable();
+    _request();
+  }
+
+  @override
+  detached() {
+    super.detached();
+    _r.disable(notify: true);
+    children = [];
+  }
+
+  void render() {
+    var content = [
+      navBar([
+        new NavTopMenuElement(queue: _r.queue),
+        new NavVMMenuElement(_vm, _events, queue: _r.queue),
+        navMenu('native memory profile', link: Uris.nativeMemory()),
+        new NavRefreshElement(queue: _r.queue)..onRefresh.listen(_refresh),
+        new NavNotifyElement(_notifications, queue: _r.queue)
+      ]),
+    ];
+    if (_progress == null) {
+      children = content;
+      return;
+    }
+    content.add(new SampleBufferControlElement(_progress, _progressStream,
+        selectedTag: _tag, queue: _r.queue)
+      ..onTagChange.listen((e) {
+        _tag = e.element.selectedTag;
+        _request();
+      }));
+    if (_progress.status == M.SampleProfileLoadingStatus.loaded) {
+      CpuProfileVirtualTreeElement tree;
+      content.addAll([
+        new BRElement(),
+        new StackTraceTreeConfigElement(
+            mode: _mode,
+            direction: _direction,
+            filter: _filter,
+            queue: _r.queue)
+          ..onModeChange.listen((e) {
+            _mode = tree.mode = e.element.mode;
+          })
+          ..onFilterChange.listen((e) {
+            _filter = e.element.filter.trim();
+            tree.filters = _filter.isNotEmpty
+                ? [
+                    (node) {
+                      return node.name.contains(_filter);
+                    }
+                  ]
+                : const [];
+          })
+          ..onDirectionChange.listen((e) {
+            _direction = tree.direction = e.element.direction;
+          }),
+        new BRElement(),
+        tree = new CpuProfileVirtualTreeElement(_vm, _progress.profile,
+            queue: _r.queue, type: M.SampleProfileType.memory)
+      ]);
+    }
+    children = content;
+  }
+
+  Future _request({bool forceFetch: false}) async {
+    _progress = null;
+    _progressStream = _profiles.get(_vm, _tag, forceFetch: forceFetch);
+    _r.dirty();
+    _progress = (await _progressStream.first).progress;
+    _r.dirty();
+    if (M.isSampleProcessRunning(_progress.status)) {
+      _progress = (await _progressStream.last).progress;
+      _r.dirty();
+    }
+  }
+
+  Future _refresh(e) async {
+    e.element.disabled = true;
+    await _request(forceFetch: true);
+    e.element.disabled = false;
+  }
+}