Fixed missing method referenced when MallocHooks is unsupported.

runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart

Index: runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart
diff --git a/runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart b/runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart
index 7617a20da4ada1bc6083171d19f10695b4699cf2..3eed1fb738df1ecb8ad2a8d5cd009770bf8a05ca 100644
--- a/runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart
+++ b/runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart
@@ -29,12 +29,14 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
 
   M.ProfileTreeDirection _direction;
   ProfileTreeMode _mode;
+  M.SampleProfileType _type;
   M.IsolateRef _isolate;
   M.SampleProfile _profile;
   Iterable<M.CallTreeNodeFilter> _filters;
 
   M.ProfileTreeDirection get direction => _direction;
   ProfileTreeMode get mode => _mode;
+  M.SampleProfileType get type => _type;
   M.IsolateRef get isolate => _isolate;
   M.SampleProfile get profile => _profile;
   Iterable<M.CallTreeNodeFilter> get filters => _filters;
@@ -50,9 +52,9 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
   factory CpuProfileVirtualTreeElement(
       M.IsolateRef isolate, M.SampleProfile profile,
       {ProfileTreeMode mode: ProfileTreeMode.function,
+      M.SampleProfileType type: M.SampleProfileType.cpu,
       M.ProfileTreeDirection direction: M.ProfileTreeDirection.exclusive,
       RenderingQueue queue}) {
-    assert(isolate != null);
     assert(profile != null);
     assert(mode != null);
     assert(direction != null);
@@ -61,6 +63,7 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
     e._isolate = isolate;
     e._profile = profile;
     e._mode = mode;
+    e._type = type;
     e._direction = direction;
     return e;
   }
@@ -84,18 +87,37 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
 
   void render() {
     var tree;
+    var create;
     var update;
-    switch (mode) {
-      case ProfileTreeMode.code:
-        tree = _profile.loadCodeTree(_direction);
-        update = _updateCodeRow;
+
+    switch (type) {
+      case M.SampleProfileType.cpu:
+        create = _createCpuRow;
+        if (mode == ProfileTreeMode.code) {
+          update = _updateCpuCodeRow;
+          tree = _profile.loadCodeTree(_direction);
+        } else if (mode == ProfileTreeMode.function) {
+          update = _updateCpuFunctionRow;
+          tree = _profile.loadFunctionTree(_direction);
+        } else {
+          throw new Exception('Unknown ProfileTreeMode: $mode');
+        }
         break;
-      case ProfileTreeMode.function:
-        tree = _profile.loadFunctionTree(_direction);
-        update = _updateFunctionRow;
+      case M.SampleProfileType.memory:
+        create = _createMemoryRow;
+        if (mode == ProfileTreeMode.code) {
+          update = _updateMemoryCodeRow;
+          tree = _profile.loadCodeTree(_direction);
+        } else if (mode == ProfileTreeMode.function) {
+          update = _updateMemoryFunctionRow;
+          tree = _profile.loadFunctionTree(_direction);
+        } else {
+          throw new Exception('Unknown ProfileTreeMode: $mode');
+        }
         break;
       default:
-        throw new Exception('Unknown ProfileTreeMode: $mode');
+        throw new Exception('Unknown SampleProfileType: $type');
+        break;
     }
     if (filters != null) {
       tree = filters.fold(tree, (tree, filter) {
@@ -106,7 +128,7 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
       children = [new HeadingElement.h1()..text = 'No Results'];
       return;
     }
-    _tree = new VirtualTreeElement(_createRow, update, _getChildren,
+    _tree = new VirtualTreeElement(create, update, _getChildren,
         items: tree.root.children, queue: _r.queue);
     if (tree.root.children.length == 1) {
       _tree.expand(tree.root.children.first, autoExpandSingleChildNodes: true);
@@ -114,7 +136,7 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
     children = [_tree];
   }
 
-  static Element _createRow(toggle) {
+  static Element _createCpuRow(toggle) {
     return new DivElement()
       ..classes = ['tree-item']
       ..children = [
@@ -135,9 +157,33 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
       ];
   }
 
+  static Element _createMemoryRow(toggle) {
+    return new DivElement()
+      ..classes = ['tree-item']
+      ..children = [
+        new SpanElement()
+          ..classes = ['inclusive']
+          ..title = 'memory allocated from resulting calls: ',
+        new SpanElement()
+          ..classes = ['exclusive']
+          ..title = 'memory allocated during execution: ',
+        new SpanElement()..classes = ['lines'],
+        new ButtonElement()
+          ..classes = ['expander']
+          ..onClick.listen((_) => toggle(autoToggleSingleChildNodes: true)),
+        new SpanElement()
+          ..classes = ['percentage']
+          ..title = 'tree node %',
+        new SpanElement()..classes = ['name']
+      ];
+  }
+
   static _getChildren(M.CallTreeNode node) => node.children;
 
-  void _updateFunctionRow(
+  static const String _expandedIcon = '▼';
+  static const String _collapsedIcon = '►';
+
+  void _updateCpuFunctionRow(
       HtmlElement element, M.FunctionCallTreeNode item, int depth) {
     element.children[0].text = Utils
         .formatPercentNormalized(item.profileFunction.normalizedInclusiveTicks);
@@ -145,7 +191,8 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
         .formatPercentNormalized(item.profileFunction.normalizedExclusiveTicks);
     _updateLines(element.children[2].children, depth);
     if (item.children.isNotEmpty) {
-      element.children[3].text = _tree.isExpanded(item) ? '▼' : '►';
+      element.children[3].text =
+          _tree.isExpanded(item) ? _expandedIcon : _collapsedIcon;
     } else {
       element.children[3].text = '';
     }
@@ -155,14 +202,39 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
       ..classes = ['name'];
   }
 
-  void _updateCodeRow(HtmlElement element, M.CodeCallTreeNode item, int depth) {
+  void _updateMemoryFunctionRow(
+      HtmlElement element, M.FunctionCallTreeNode item, int depth) {
+    element.children[0].text =
+        Utils.formatSize(item.inclusiveNativeAllocations);
+    element.children[0].title = 'memory allocated from resulting calls: ' +
+        '${item.inclusiveNativeAllocations}B';
+    element.children[1].text =
+        Utils.formatSize(item.exclusiveNativeAllocations);
+    element.children[1].title = 'memory allocated during execution: ' +
+        '${item.exclusiveNativeAllocations}B';
+    _updateLines(element.children[2].children, depth);
+    if (item.children.isNotEmpty) {
+      element.children[3].text =
+          _tree.isExpanded(item) ? _expandedIcon : _collapsedIcon;
+    } else {
+      element.children[3].text = '';
+    }
+    element.children[4].text = Utils.formatPercentNormalized(item.percentage);
+    element.children[5] = new FunctionRefElement(
+        null, item.profileFunction.function, queue: _r.queue)
+      ..classes = ['name'];
+  }
+
+  void _updateCpuCodeRow(
+      HtmlElement element, M.CodeCallTreeNode item, int depth) {
     element.children[0].text = Utils
         .formatPercentNormalized(item.profileCode.normalizedInclusiveTicks);
     element.children[1].text = Utils
         .formatPercentNormalized(item.profileCode.normalizedExclusiveTicks);
     _updateLines(element.children[2].children, depth);
     if (item.children.isNotEmpty) {
-      element.children[3].text = _tree.isExpanded(item) ? '▼' : '►';
+      element.children[3].text =
+          _tree.isExpanded(item) ? _expandedIcon : _collapsedIcon;
     } else {
       element.children[3].text = '';
     }
@@ -171,6 +243,28 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
         queue: _r.queue)..classes = ['name'];
   }
 
+  void _updateMemoryCodeRow(
+      HtmlElement element, M.CodeCallTreeNode item, int depth) {
+    element.children[0].text =
+        Utils.formatSize(item.inclusiveNativeAllocations);
+    element.children[0].title = 'memory allocated from resulting calls: ' +
+        '${item.inclusiveNativeAllocations}B';
+    element.children[1].text =
+        Utils.formatSize(item.exclusiveNativeAllocations);
+    element.children[1].title = 'memory allocated during execution: ' +
+        '${item.exclusiveNativeAllocations}B';
+    _updateLines(element.children[2].children, depth);
+    if (item.children.isNotEmpty) {
+      element.children[3].text =
+          _tree.isExpanded(item) ? _expandedIcon : _collapsedIcon;
+    } else {
+      element.children[3].text = '';
+    }
+    element.children[4].text = Utils.formatPercentNormalized(item.percentage);
+    element.children[5] = new CodeRefElement(null, item.profileCode.code,
+        queue: _r.queue)..classes = ['name'];
+  }
+
   static _updateLines(List<Element> lines, int n) {
     n = Math.max(0, n);
     while (lines.length > n) {