Fix TraceEventTestFixture flakiness

BUG=142804


Review URL: https://chromiumcodereview.appspot.com/10828326

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151851 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 28 insertions, 6 deletions

diff --git a/base/debug/trace_event_unittest.cc b/base/debug/trace_event_unittest.cc
index 5d32f2f..f806cf1 100644
--- a/base/debug/trace_event_unittest.cc
+++ b/base/debug/trace_event_unittest.cc
@@ -2,10 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/debug/trace_event.h"
+#include "base/debug/trace_event_unittest.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/debug/trace_event.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/ref_counted_memory.h"
@@ -20,6 +21,8 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using base::debug::HighResSleepForTraceTest;
+
 namespace base {
 namespace debug {
 
@@ -633,6 +636,13 @@ void TraceCallsWithCachedCategoryPointersPointers(const char* name_str) {
 
 }  // namespace
 
+void HighResSleepForTraceTest(base::TimeDelta elapsed) {
+  base::TimeTicks end_time = base::TimeTicks::HighResNow() + elapsed;
+  do {
+    base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(1));
+  } while (base::TimeTicks::HighResNow() < end_time);
+}
+
 // Simple Test for emitting data and validating it was received.
 TEST_F(TraceEventTestFixture, DataCaptured) {
   ManualTestSetUp();
@@ -843,7 +853,7 @@ TEST_F(TraceEventTestFixture, DataCapturedThreshold) {
     // 100+ seconds to avoid flakiness.
     TRACE_EVENT_IF_LONGER_THAN0(100000000, "time", "threshold long1");
     TRACE_EVENT_IF_LONGER_THAN0(200000000, "time", "threshold long2");
-    base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(20));
+    HighResSleepForTraceTest(base::TimeDelta::FromMilliseconds(20));
   }
 
   // Test that a normal nested event remains after it's parent event is dropped.
@@ -868,8 +878,7 @@ TEST_F(TraceEventTestFixture, DataCapturedThreshold) {
             TRACE_EVENT_IF_LONGER_THAN0(1000, "time", "3threshold1000");
             {
               TRACE_EVENT_IF_LONGER_THAN0(100, "time", "3threshold100");
-              base::PlatformThread::Sleep(
-                  base::TimeDelta::FromMilliseconds(20));
+              HighResSleepForTraceTest(base::TimeDelta::FromMilliseconds(20));
             }
           }
         }
@@ -893,8 +902,7 @@ TEST_F(TraceEventTestFixture, DataCapturedThreshold) {
             {
               TRACE_EVENT_IF_LONGER_THAN0(200000000, "time",
                                           "4thresholdlong2");
-              base::PlatformThread::Sleep(
-                  base::TimeDelta::FromMilliseconds(20));
+              HighResSleepForTraceTest(base::TimeDelta::FromMilliseconds(20));
             }
           }
         }
diff --git a/base/debug/trace_event_unittest.h b/base/debug/trace_event_unittest.h
new file mode 100644
index 0000000..3b570e1
--- /dev/null
+++ b/base/debug/trace_event_unittest.h
@@ -0,0 +1,14 @@
+// Copyright (c) 2012 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.
+
+#include "base/time.h"
+
+namespace base {
+namespace debug {
+
+// Sleep until HighResNow has advanced by at least |elapsed|.
+void HighResSleepForTraceTest(base::TimeDelta elapsed);
+
+}  // namespace debug
+}  // namespace base