Update duration when demuxed packets exceed known duration.

media/test/pipeline_integration_test_base.cc

Index: media/test/pipeline_integration_test_base.cc
diff --git a/media/test/pipeline_integration_test_base.cc b/media/test/pipeline_integration_test_base.cc
index f40f590f0bcb73b2ec0c757c5be92beaaae0ec9e..6115e472de8fe8c4af21db49b25b12d4e5cced96 100644
--- a/media/test/pipeline_integration_test_base.cc
+++ b/media/test/pipeline_integration_test_base.cc
@@ -144,13 +144,22 @@ PipelineStatus PipelineIntegrationTestBase::StartInternal(
       .Times(AnyNumber());
   EXPECT_CALL(*this, OnBufferingStateChange(BUFFERING_HAVE_NOTHING))
       .Times(AnyNumber());
-  // Permit at most two calls to OnDurationChange.  CheckDuration will make sure
-  // that no more than one of them is a finite duration.  This allows the
-  // pipeline to call back at the end of the media with the known duration.
-  EXPECT_CALL(*this, OnDurationChange())
-      .Times(AtMost(2))
-      .WillRepeatedly(
-          Invoke(this, &PipelineIntegrationTestBase::CheckDuration));
+  // If the test is expected to have reliable duration information, permit at
+  // most two calls to OnDurationChange.  CheckDuration will make sure that no
+  // more than one of them is a finite duration.  This allows the pipeline to
+  // call back at the end of the media with the known duration.
+  //
+  // In the event of unreliable duration information, just set the expectation
+  // that it's called at least once. Such streams may repeatedly update their
+  // duration as new packets are demuxed.
+  if (test_type & kUnreliableDuration) {
+    EXPECT_CALL(*this, OnDurationChange()).Times(AtLeast(1));
+  } else {
+    EXPECT_CALL(*this, OnDurationChange())
+        .Times(AtMost(2))
+        .WillRepeatedly(
+            Invoke(this, &PipelineIntegrationTestBase::CheckDuration));
+  }
   EXPECT_CALL(*this, OnVideoNaturalSizeChange(_)).Times(AtMost(1));
   EXPECT_CALL(*this, OnVideoOpacityChange(_)).WillRepeatedly(Return());
   CreateDemuxer(std::move(data_source));