Converted Observatory cpu-profile-table element

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 236b3952228b07075f5123fb116545c734754fcc..57c85a9aba6701717409444bba7200ae5309bc0e 100644
--- a/runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart
+++ b/runtime/observatory/lib/src/elements/cpu_profile/virtual_tree.dart
@@ -31,19 +31,21 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
   ProfileTreeMode _mode;
   M.IsolateRef _isolate;
   M.SampleProfile _profile;
-  M.CallTreeNodeFilter _filter;
+  Iterable<M.CallTreeNodeFilter> _filters;
 
   M.ProfileTreeDirection get direction => _direction;
   ProfileTreeMode get mode => _mode;
   M.IsolateRef get isolate => _isolate;
   M.SampleProfile get profile => _profile;
-  M.CallTreeNodeFilter get filter => _filter;
+  Iterable<M.CallTreeNodeFilter> get filters => _filters;
 
   set direction(M.ProfileTreeDirection value) =>
       _direction = _r.checkAndReact(_direction, value);
   set mode(ProfileTreeMode value) => _mode = _r.checkAndReact(_mode, value);
-  set filter(M.CallTreeNodeFilter value) =>
-      _filter = _r.checkAndReact(_filter, value);
+  set filters(Iterable<M.CallTreeNodeFilter> value) {
+    _filters = new List.unmodifiable(value);
+    _r.dirty();
+  }
 
   factory CpuProfileVirtualTreeElement(M.IsolateRef isolate,
       M.SampleProfile profile, {ProfileTreeMode mode: ProfileTreeMode.function,
@@ -94,15 +96,17 @@ class CpuProfileVirtualTreeElement extends HtmlElement implements Renderable {
       default:
         throw new Exception('Unknown ProfileTreeMode: $mode');
     }
+    if (filters != null) {
+      tree = filters.fold(tree, (tree, filter) {
+        return tree?.filtered(filter);
+      });
+    }
     if (tree == null) {
       children = [
         new HeadingElement.h1()..text = 'No Results'
       ];
       return;
     }
-    if (filter != null) {
-      tree = tree.filtered(filter);
-    }
     _tree = new VirtualTreeElement(_createRow, update, _getChildren,
       items: tree.root.children, queue: _r.queue);
     if (tree.root.children.length == 1) {