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

runtime/observatory/test/code_test.dart

+// Copyright (c) 2015, 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.
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+import 'dart:async';
+
+int counter = 0;
+
+void funcB() {
+  counter++;  // line 13
+  if (counter % 100000000 == 0) {
+    print(counter);
+  }
+}
+
+void funcA() {
+  funcB();
+}
+
+void testFunction() {
+  while (true) {
+    funcA();
+  }
+}
+
+var tests = [
+
+// Go to breakpoint at line 13.
+(Isolate isolate) {
+  return isolate.rootLib.load().then((_) {
+      // Set up a listener to wait for breakpoint events.
+      Completer completer = new Completer();
+      List events = [];
+      isolate.vm.events.stream.listen((ServiceEvent event) {
+        if (event.eventType == 'BreakpointReached') {
+          print('Breakpoint reached');
+          completer.complete();
+        }
+      });
+
+      // Add the breakpoint.
+      var script = isolate.rootLib.scripts[0];
+      var line = 13;
+      return isolate.addBreakpoint(script, line).then((ServiceObject bpt) {
+          return completer.future;  // Wait for breakpoint reached.
+      });
+    });
+},
+
+// Inspect code objects for top two frames.
+(Isolate isolate) {
+  return isolate.getStack().then((ServiceMap stack) {
+      // Make sure we are in the right place.
+      expect(stack.type, equals('Stack'));
+      expect(stack['frames'].length, greaterThanOrEqualTo(3));
+      var frame0 = stack['frames'][0];
+      var frame1 = stack['frames'][1];
+      print(frame0);
+      expect(frame0['function'].name, equals('funcB'));
+      expect(frame1['function'].name, equals('funcA'));
+      var codeId0 = frame0['code'].id;
+      var codeId1 = frame1['code'].id;
+
+      List tests = [];
+      // Load code from frame 0.
+      tests.add(isolate.get(codeId0)..then((ServiceObject code) {
+            expect(code.type, equals('Code'));
+            expect(code.function.name, equals('funcB'));
+            expect(code.hasDisassembly, equals(true));
+          }));
+      // Load code from frame 0.
+      tests.add(isolate.get(codeId1)..then((ServiceObject code) {
+            expect(code.type, equals('Code'));
+            expect(code.function.name, equals('funcA'));
+            expect(code.hasDisassembly, equals(true));
+          }));
+      return Future.wait(tests);
+  });
+},
+
+];
+
+main(args) => runIsolateTests(args, tests, testeeConcurrent: testFunction);