Fix pipeline integration tests for seek / duration changes.

media/test/pipeline_integration_test_base.h

Index: media/test/pipeline_integration_test_base.h
diff --git a/media/test/pipeline_integration_test_base.h b/media/test/pipeline_integration_test_base.h
index 258591b8867f1fc067b1dcd8e25f069144991b4f..c397e3ad064498f196ff59ede4ce66f6b0858d25 100644
--- a/media/test/pipeline_integration_test_base.h
+++ b/media/test/pipeline_integration_test_base.h
@@ -151,6 +151,7 @@ class PipelineIntegrationTestBase : public Pipeline::Client {
   DummyTickClock dummy_clock_;
   PipelineMetadata metadata_;
   scoped_refptr<VideoFrame> last_frame_;
+  base::TimeDelta current_duration_;
 
   PipelineStatus StartInternal(
       std::unique_ptr<DataSource> data_source,
@@ -191,6 +192,11 @@ class PipelineIntegrationTestBase : public Pipeline::Client {
 
   void OnVideoFramePaint(const scoped_refptr<VideoFrame>& frame);
 
+  void CheckDuration();
+
+  // Return the media start time from |demuxer_|.
+  base::TimeDelta GetStartTime();
+
   MOCK_METHOD1(DecryptorAttached, void(bool));
   // Pipeline::Client overrides.
   void OnError(PipelineStatus status) override;