Observatory: Include profiler samples in the timeline view.

runtime/observatory/tests/service/get_cpu_profile_timeline_rpc_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.
+// VMOptions=--error_on_bad_type --error_on_bad_override
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+
+import 'test_helper.dart';
+
+fib(n) {
+  if (n < 0) return 0;
+  if (n == 0) return 1;
+  return fib(n - 1) + fib(n - 2);
+}
+
+testeeDo() {
+  print("Testee doing something.");
+  fib(25);
+  print("Testee did something.");
+}
+
+var tests = [
+  (Isolate isolate) async {
+    var params = {
+      'tags': 'VMUser'
+    };
+    var result = await isolate.invokeRpcNoUpgrade(
+        '_getCpuProfileTimeline', params);
+    print(result);
+    expect(result['type'], equals('_CpuProfileTimeline'));
+
+    var isString = new isInstanceOf<String>();
+
+    Map frames = result['stackFrames'];
+    for (Map frame in frames.values) {
+      expect(frame['category'], isString);
+      expect(frame['name'], isString);
+      if (frame['parent'] != null) {
+        expect(frames.containsKey(frame['parent']), isTrue);
+      }
+    }
+
+    List events = result['traceEvents'];
+    for (Map event in events) {
+      expect(event['ph'], equals('P'));
+      expect(event['pid'], isString);
+      expect(event['tid'], isString);
+      expect(event['ts'], isString);
+      expect(event['category'], equals("Dart"));
+      expect(frames.containsKey(event['sf']), isTrue);
+    }
+  },
+];
+
+main(args) async => runIsolateTests(args, tests, testeeBefore: testeeDo);