Modify TraceEventTestFixture.TraceBufferVectorReportFull to assert the...

Modify TraceEventTestFixture.TraceBufferVectorReportFull to assert the overflowed_at_ts is between the timestamp of last event and current trace_log's time.

BUG=395739

Review URL: https://codereview.chromium.org/402283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284702 0039d316-1c4b-4281-b951-d872f2087c98

base/debug/trace_event_unittest.cc

@@ -2450,16 +2450,17 @@ TEST_F(TraceEventTestFixture, TraceBufferVectorReportFull) {
           trace_log->buffer_limit_reached_timestamp_.ToInternalValue()),
       buffer_limit_reached_timestamp);
 
-  // Test that buffer_limit_reached_timestamp's value is near to the timestamp
-  // of the last trace event.
+  // Test that buffer_limit_reached_timestamp's value is between the timestamp
+  // of the last trace event and current time.
   DropTracedMetadataRecords();
   const DictionaryValue* last_trace_event = NULL;
   double last_trace_event_timestamp = 0;
   EXPECT_TRUE(trace_parsed_.GetDictionary(trace_parsed_.GetSize() - 1,
                                           &last_trace_event));
   EXPECT_TRUE(last_trace_event->GetDouble("ts", &last_trace_event_timestamp));
-  // The difference between the two timestamps should be less than 50ms.
-  EXPECT_NEAR(last_trace_event_timestamp, buffer_limit_reached_timestamp, 50);
+  EXPECT_LT(last_trace_event_timestamp, buffer_limit_reached_timestamp);
+  EXPECT_LT(buffer_limit_reached_timestamp,
+            trace_log->OffsetNow().ToInternalValue());
 }
 
 TEST_F(TraceEventTestFixture, TraceBufferRingBufferGetReturnChunk) {