Find feature for tracing, at long last.

chrome/browser/resources/tracing/test_utils.js

Index: chrome/browser/resources/tracing/test_utils.js
diff --git a/chrome/browser/resources/tracing/test_utils.js b/chrome/browser/resources/tracing/test_utils.js
index a8800f1238ec5de3bf8fe96f14c62e8285036ce5..30dd5e6556e4b8da7bc2ddcd61e0fa6f122bc6f9 100644
--- a/chrome/browser/resources/tracing/test_utils.js
+++ b/chrome/browser/resources/tracing/test_utils.js
@@ -38,7 +38,27 @@ cr.define('test_utils', function() {
     };
     req.send(null);
   }
+
+  function newAsyncSlice(start, duration, startThread, endThread) {
+    return newAsyncSliceNamed('a', start, duration, startThread, endThread);
+  }
+
+  function newAsyncSliceNamed(name, start, duration, startThread, endThread) {
+    var s = new tracing.TimelineAsyncSlice(name, 0, start);
+    s.duration = duration;
+    s.startThread = startThread;
+    s.endThread = endThread;
+    var subSlice = new tracing.TimelineAsyncSlice(name, 0, start);
+    subSlice.duration = duration;
+    subSlice.startThread = startThread;
+    subSlice.endThread = endThread;
+    s.subSlices = [subSlice];
+    return s;
+  }
+
   return {
-    getAsync: getAsync
+    getAsync: getAsync,
+    newAsyncSlice: newAsyncSlice,
+    newAsyncSliceNamed: newAsyncSliceNamed
   };
 });