Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

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

 // 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 cpu_profile_element;
 
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
@@ skipping 122 matching lines @@
 
   bool hasChildren() {
     return node.children.length > 0;
   }
 }
 
 /// Displays a CpuProfile
 @CustomTag('cpu-profile')
 class CpuProfileElement extends ObservatoryElement {
   CpuProfileElement.created() : super.created();
-  @published ServiceMap profile;
+  @published Isolate isolate;
+
+  @observable ServiceMap profile;
   @observable bool hideTagsChecked;
   @observable String sampleCount = '';
   @observable String refreshTime = '';
   @observable String sampleRate = '';
   @observable String sampleDepth = '';
   @observable String displayCutoff = '';
   @observable String timeSpan = '';
   @reflectable double displayThreshold = 0.0002; // 0.02%.
 
-  @observable String tagSelector = 'uv';
+  @observable String tagSelector = 'UserVM';
 
   final _id = '#tableTree';
   TableTree tree;
 
   static const MICROSECONDS_PER_SECOND = 1000000.0;
 
-  void profileChanged(oldValue) {
-    if (profile == null) {
+  void isolateChanged(oldValue) {
+    if (isolate == null) {
+      profile = null;
       return;
     }
-    var totalSamples = profile['samples'];
-    var now = new DateTime.now();
-    sampleCount = totalSamples.toString();
-    refreshTime = now.toString();
-    sampleDepth = profile['depth'].toString();
-    var period = profile['period'];
-    sampleRate = (MICROSECONDS_PER_SECOND / period).toStringAsFixed(0);
-    timeSpan = formatTime(profile['timeSpan']);
-    displayCutoff = '${(displayThreshold * 100.0).toString()}%';
-    profile.isolate.processProfile(profile);
-    profile['threshold'] = displayThreshold;
-    _update();
+    isolate.invokeRpc('getCpuProfile', { 'tags': tagSelector })
+      .then((ServiceObject obj) {
+          print(obj);
+          // Assert we got back the a profile.
+          assert(obj.type == 'CpuProfile');
+          profile = obj;
+          _update();
+      });
   }
 
-
   @override
   void attached() {
     super.attached();
     var tableBody = shadowRoot.querySelector('#tableTreeBody');
     assert(tableBody != null);
     tree = new TableTree(tableBody, 2);
     _update();
   }
 
   void tagSelectorChanged(oldValue) {
-    refresh(null);
+    isolateChanged(null);
   }
 
   void refresh(var done) {
-    var request = 'profile?tags=$tagSelector';
-    profile.isolate.get(request).then((ServiceMap m) {
-      // Assert we got back the a profile.
-      assert(m.type == 'Profile');
-      profile = m;
-    }).whenComplete(done);
+    isolate.invokeRpc('getCpuProfile', { 'tags': tagSelector })
+      .then((ServiceObject obj) {
+          // Assert we got back the a profile.
+          assert(obj.type == 'CpuProfile');
+          profile = obj;
+          _update();
+      }).whenComplete(done);
   }
 
   void _update() {
     if (profile == null) {
       return;
     }
+    var totalSamples = profile['samples'];
+    var now = new DateTime.now();
+    sampleCount = totalSamples.toString();
+    refreshTime = now.toString();
+    sampleDepth = profile['depth'].toString();
+    var period = profile['period'];
+    sampleRate = (MICROSECONDS_PER_SECOND / period).toStringAsFixed(0);
+    timeSpan = formatTime(profile['timeSpan']);
+    displayCutoff = '${(displayThreshold * 100.0).toString()}%';
+    profile.isolate.processProfile(profile);
+    profile['threshold'] = displayThreshold;
     _buildTree();
   }
 
   void _buildStackTree() {
     var root = profile.isolate.profileTrieRoot;
     if (root == null) {
       return;
     }
     try {
       tree.initialize(
           new ProfileCodeTrieNodeTreeRow(profile, root, root, tree, null));
     } catch (e, stackTrace) {
       print(e);
       print(stackTrace);
       Logger.root.warning('_buildStackTree', e, stackTrace);
     }
     // Check if we only have one node at the root and expand it.
     if (tree.rows.length == 1) {
       tree.toggle(tree.rows[0]);
     }
     notifyPropertyChange(#tree, null, tree);
   }
 
   void _buildTree() {
     _buildStackTree();
   }
 }