Fix TimelinePauses_Basic test failure

runtime/vm/timeline_test.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <cstring>
 
 #include "platform/assert.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
@@ skipping 423 matching lines @@
   const char* beta = strstr(js.ToCString(), "Beta");
   EXPECT(alpha < beta);
 }
 
 
 TEST_CASE(TimelinePauses_Basic) {
   TimelineEventEndlessRecorder* recorder = new TimelineEventEndlessRecorder();
   ASSERT(recorder != NULL);
   Zone* zone = thread->zone();
   Isolate* isolate = thread->isolate();
-  ThreadId tid = OSThread::GetCurrentThreadId();
+  ThreadId tid = OSThread::GetCurrentThreadTraceId();
 
   // Test case.
   TimelineTestHelper::FakeDuration(recorder, "a", 0, 10);
   {
     TimelinePauses pauses(zone, isolate, recorder);
     pauses.Setup();
     pauses.CalculatePauseTimesForThread(tid);
     EXPECT(!pauses.has_error());
     EXPECT_EQ(10, pauses.InclusiveTime("a"));
     EXPECT_EQ(10, pauses.ExclusiveTime("a"));
@@ skipping 144 matching lines @@
     EXPECT(!pauses.has_error());
     EXPECT_EQ(10, pauses.InclusiveTime("a"));
     EXPECT_EQ(10, pauses.ExclusiveTime("a"));
     EXPECT_EQ(10, pauses.MaxInclusiveTime("a"));
     EXPECT_EQ(8, pauses.MaxExclusiveTime("a"));
   }
   TimelineTestHelper::Clear(recorder);
 }
 
 }  // namespace dart