about:gpu support for thread name metadata.

chrome/browser/resources/gpu_internals/tracing_controller_tests.js

 // Copyright (c) 2011 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.
 cr.define('gpu', function() {
   var dataSets = [
     {
       name: "big_trace",
       events_url: "./tests/big_trace.json"
     },
     {
+      name: "trivial_trace",
+      events: [
+        {"name":"a","args":{},"pid":6052,"ts":3074899524,"cat":"foo","tid":6053,"ph":"B"},
+        {"name":"a","args":{},"pid":6052,"ts":3074899560,"cat":"foo","tid":6053,"ph":"E"},
+        {"name":"b","args":{},"pid":6052,"ts":3074899629,"cat":"foo","tid":6053,"ph":"B"},
+        {"name":"b","args":{},"pid":6052,"ts":3074899631,"cat":"foo","tid":6053,"ph":"E"},
+      ]
+    },
+    {
       name: "simple_trace",
       events: [
         {"cat":"PERF","pid":22630,"tid":22630,"ts":826,"ph":"B","name":"A","args":{}},
         {"cat":"PERF","pid":22630,"tid":22630,"ts":827,"ph":"B","name":"Asub","args":{}},
         {"cat":"PERF","pid":22630,"tid":22630,"ts":828,"ph":"E","name":"Asub","args":{}},
         {"cat":"PERF","pid":22630,"tid":22630,"ts":829,"ph":"B","name":"Asub","args":{}},
         {"cat":"PERF","pid":22630,"tid":22630,"ts":832,"ph":"E","name":"Asub","args":{}},
         {"cat":"PERF","pid":22630,"tid":22630,"ts":833,"ph":"E","name":"","args":{}},
 
         {"cat":"PERF","pid":22630,"tid":22630,"ts":840,"ph":"B","name":"A","args":{}},
         {"cat":"PERF","pid":22630,"tid":22630,"ts":848,"ph":"E","name":"A","args":{}},
 
         {"cat":"PERF","pid":22630,"tid":22630,"ts":850,"ph":"B","name":"B","args":{}},
         {"cat":"PERF","pid":22630,"tid":22630,"ts":854,"ph":"E","name":"B","args":{}},
 
         {"cat":"PERF","pid":22630,"tid":22631,"ts":827,"ph":"B","name":"A","args":{}},
-        {"cat":"PERF","pid":22630,"tid":22631,"ts":854,"ph":"E","name":"A","args":{}}
+        {"cat":"PERF","pid":22630,"tid":22631,"ts":854,"ph":"E","name":"A","args":{}},
+
+        {"cat":"__metadata","pid":22630,"tid":22630,"ts":0,"ph":"M","name":"thread_name","args":{"name": "threadA"}},
+        {"cat":"__metadata","pid":22630,"tid":22631,"ts":0,"ph":"M","name":"thread_name","args":{"name": "threadB"}},
+        {"cat":"__metadata","pid":22630,"tid":22632,"ts":0,"ph":"M","name":"thread_name","args":{"name": "threadC"}},
       ]
     },
     {
       name: "nonnested_trace",
       events: [
         {'cat':'PERF','pid':22630,'tid':22630,'ts':826,'ph':'B','name':'A','args':{}},
         {'cat':'PERF','pid':22630,'tid':22630,'ts':827,'ph':'B','name':'Asub','args':{}},
         {'cat':'PERF','pid':22630,'tid':22630,'ts':829,'ph':'B','name':'NonNest','args':{'id':'1','ui-nest':'0'}},
         {'cat':'PERF','pid':22630,'tid':22630,'ts':830,'ph':'B','name':'NonNest','args':{'id':'2','ui-nest':'0'}},
         {'cat':'PERF','pid':22630,'tid':22630,'ts':831,'ph':'E','name':'Asub','args':{}},
@@ skipping 127 matching lines @@
           };
           req.send(null);
         }
       },
 
       endTracing: function() {
       }
     }
   };
 });