Initialize media timeline correctly for positive start times.

media/filters/pipeline_integration_test.cc

Index: media/filters/pipeline_integration_test.cc
diff --git a/media/filters/pipeline_integration_test.cc b/media/filters/pipeline_integration_test.cc
index 3d70558aeb1d17e2a3db9588354670f3c10bd7d9..ac2e2056a31c1028183401b78d50f5d829a9ec55 100644
--- a/media/filters/pipeline_integration_test.cc
+++ b/media/filters/pipeline_integration_test.cc
@@ -1563,6 +1563,7 @@ TEST_F(PipelineIntegrationTest, BasicPlaybackChainedOgg) {
   ASSERT_TRUE(Start(GetTestDataFilePath("double-sfx.ogg"), PIPELINE_OK));
   Play();
   ASSERT_TRUE(WaitUntilOnEnded());
+  ASSERT_EQ(base::TimeDelta(), demuxer_->GetStartTime());
 }
 
 // Ensures audio-video playback with missing or negative timestamps fails softly
@@ -1571,6 +1572,7 @@ TEST_F(PipelineIntegrationTest, BasicPlaybackChainedOggVideo) {
   ASSERT_TRUE(Start(GetTestDataFilePath("double-bear.ogv"), PIPELINE_OK));
   Play();
   EXPECT_EQ(PIPELINE_ERROR_DECODE, WaitUntilEndedOrError());
+  ASSERT_EQ(base::TimeDelta(), demuxer_->GetStartTime());

[scherkus (not reviewing), 2014/09/16 00:07:31]

do we have (need?) tests that verify non-zero start time?

[DaleCurtis, 2014/09/16 00:10:07]

FFmpegDemuxer has a nonzero-start-time.webm we can try using as a
PipelineIntegrationTest.  I'll see about using it here.

 }
 
 // Tests that we signal ended even when audio runs longer than video track.