DevTools: [Timeline] extract common infrastructure from tracing tests.

LayoutTests/http/tests/inspector-protocol/tracing-test.js

+// Copyright 2014 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.
+
+var evalCallbackCallId = 3;
+
+initialize_tracingHarness = function()
+{
+
+InspectorTest.startTracing = function(callback)
+{
+    InspectorTest.sendCommand("Tracing.start", { "categories": "-*,disabled-by-default-devtools.timeline", "type": "", "options": "" }, onStart);
+
+    function onStart(response)
+    {
+        InspectorTest.log("Recording started");
+        callback();
+    }
+}
+
+InspectorTest.stopTracing = function(callback)
+{
+    InspectorTest.eventHandler["Tracing.tracingComplete"] = tracingComplete;
+    InspectorTest.eventHandler["Tracing.dataCollected"] = dataCollected;
+    InspectorTest.sendCommand("Tracing.end", { }, onStop);
+
+    InspectorTest.devtoolsEvents = [];
+    function dataCollected(reply)
+    {
+        var allEvents = reply.params.value;
+        InspectorTest.devtoolsEvents = InspectorTest.devtoolsEvents.concat(allEvents.filter(function(e)
+        {
+            return e.cat === "disabled-by-default-devtools.timeline";
+        }));
+    }
+
+    function tracingComplete(event)
+    {
+        InspectorTest.log("Tracing complete");
+        InspectorTest.eventHandler["Tracing.tracingComplete"] = null;
+        InspectorTest.eventHandler["Tracing.dataCollected"] = null;
+        callback(InspectorTest.devtoolsEvents);
+    }
+
+    function onStop(response)
+    {
+        InspectorTest.log("Recording stopped");
+    }
+}
+
+InspectorTest.findEvent = function(name, ph, condition)
+{
+    for (var i = 0; i < InspectorTest.devtoolsEvents.length; i++) {
+        var e = InspectorTest.devtoolsEvents[i];
+        if (e.name === name && e.ph === ph && (!condition || condition(e)))
+            return e;
+    }
+    throw new Error("Couldn't find event " + name + " / " + ph + "\n\n in " + JSON.stringify(InspectorTest.devtoolsEvents, null, 2));
+}
+
+InspectorTest.invokeAsyncWithTracing = function(functionName, callback)
+{
+    InspectorTest.startTracing(onStart);
+
+    function onStart()
+    {
+        InspectorTest.invokePageFunctionAsync(functionName, done);
+    }
+
+    function done()
+    {
+        InspectorTest.stopTracing(callback);
+    }
+}
+
+InspectorTest._lastEvalId = 0;
+InspectorTest._pendingEvalRequests = {};
+
+InspectorTest.invokePageFunctionAsync = function(functionName, callback)
+{
+    var id = ++InspectorTest._lastEvalId;
+    InspectorTest._pendingEvalRequests[id] = callback;
+    var asyncEvalWrapper = function(callId, functionName)
+    {
+        function evalCallback(result)
+        {
+            evaluateInFrontend("InspectorTest.didInvokePageFunctionAsync(" + callId + ", " + JSON.stringify(result) + ");");
+        }
+        eval(functionName + "(" + evalCallback + ")");
+    }
+    InspectorTest.evaluateInPage("(" + asyncEvalWrapper.toString() + ")(" + id + ", unescape('" + escape(functionName) + "'))", function() { });
+}
+
+InspectorTest.didInvokePageFunctionAsync = function(callId, value)
+{
+    var callback = InspectorTest._pendingEvalRequests[callId];
+
+    if (!callback) {
+        InspectorTest.addResult("Missing callback for async eval " + callId + ", perhaps callback invoked twice?");
+        return;
+    }
+    delete InspectorTest._pendingEvalRequests[callId];
+    callback(value);
+}
+
+}
+