DevTools: adopt existing Timeline tests for tracing based Timeline

LayoutTests/http/tests/inspector/tracing/timeline-xhr-event-expected.txt

Index: LayoutTests/http/tests/inspector/tracing/timeline-xhr-event-expected.txt
diff --git a/LayoutTests/http/tests/inspector/timeline-xhr-event-expected.txt b/LayoutTests/http/tests/inspector/tracing/timeline-xhr-event-expected.txt
similarity index 56%
copy from LayoutTests/http/tests/inspector/timeline-xhr-event-expected.txt
copy to LayoutTests/http/tests/inspector/tracing/timeline-xhr-event-expected.txt
index 94df819f3b0d8476845571c6e620023fc47da63c..89acbf4019c0055e40b276d7d8fb9549403cdbfe 100644
--- a/LayoutTests/http/tests/inspector/timeline-xhr-event-expected.txt
+++ b/LayoutTests/http/tests/inspector/tracing/timeline-xhr-event-expected.txt
@@ -2,10 +2,25 @@ Tests the Timeline events for XMLHttpReqeust
 
 XHRReadyStateChange Properties:
 {
+    data : {
+        frame : <string>
+        readyState : 1

[caseq, 2014/08/22 11:11:30]

How comes we get an extra event?

[yurys, 2014/08/22 11:28:08]

Must be a bug in the previous instrumentation? readyState 0->1 transition
happens when open() is called.

[caseq, 2014/08/22 11:44:44]

Ah, I can see now. It was a feature of previous instrumentation, not a bug. We
used to record events only in case we have a listener, and we're adding one late
in this test.

+        url : .../inspector/tracing/network/resources/resource.php
+    }
+    endTime : <number>
+    frameId : <string>
+    stackTrace : <object>
+    startTime : <number>
+    thread : <string>
+    type : "XHRReadyStateChange"
+}
+XHRReadyStateChange Properties:
+{
     children : <object>
     data : {
+        frame : <string>
         readyState : 2
-        url : .../inspector/network/resources/resource.php
+        url : .../inspector/tracing/network/resources/resource.php
     }
     endTime : <number>
     frameId : <string>
@@ -17,8 +32,9 @@ XHRReadyStateChange Properties:
 {
     children : <object>
     data : {
+        frame : <string>
         readyState : 3
-        url : .../inspector/network/resources/resource.php
+        url : .../inspector/tracing/network/resources/resource.php
     }
     endTime : <number>
     frameId : <string>
@@ -30,8 +46,9 @@ XHRReadyStateChange Properties:
 {
     children : <object>
     data : {
+        frame : <string>
         readyState : 4
-        url : .../inspector/network/resources/resource.php
+        url : .../inspector/tracing/network/resources/resource.php
     }
     endTime : <number>
     frameId : <string>
@@ -43,7 +60,8 @@ XHRLoad Properties:
 {
     children : <object>
     data : {
-        url : .../inspector/network/resources/resource.php
+        frame : <string>
+        url : .../inspector/tracing/network/resources/resource.php
     }
     endTime : <number>
     frameId : <string>