Smoke test for tracing infrastructure in PyAuto

chrome/test/functional/tracing/tracer.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+window.pyautoRecordTrace = function(systemTracing) {
+  'use strict';
+  if( window.timelineModelShimId == undefined )
+    window.timelineModelShimId = 0;
+  if( window.timelineModelShims == undefined )
+    window.timelineModelShims = {};
+  var handler = function() {
+    tracingController.removeEventListener('traceEnded', handler);
+    var model = new TimelineModelShim(
+      Array.prototype.slice.call(arguments, 1)
+    );
+    var events = [tracingController.traceEvents_];
+    if (tracingController.supportsSystemTracing)
+      events.push(tracingController.systemTraceEvents_);
+    model.importTraces(events);
+    var shimId = window.timelineModelShimId;
+    window.timelineModelShims[shimId] = model;
+    window.domAutomationController.send(shimId);
+    window.timelineModelShimId++;
+  };
+  tracingController.addEventListener('traceEnded', handler);
+  var willSystemTrace =
+    tracingController.supportsSystemTracing ? systemTracing : false;
+  tracingController.beginTracing(willSystemTrace);
+  return willSystemTrace;
+};
+
+// This causes the PyAuto ExecuteJavascript call which executed this file to
+// return.
+window.domAutomationController.send('');