Fix unit test failures with estimated durations and splice frames.

media/filters/source_buffer_stream_unittest.cc

Index: media/filters/source_buffer_stream_unittest.cc
diff --git a/media/filters/source_buffer_stream_unittest.cc b/media/filters/source_buffer_stream_unittest.cc
index 3a92732e5fe97f432d7db8d418633d81a9e68aa1..fc9dd1119fcd4b0377d36ba238993371bfb1c05c 100644
--- a/media/filters/source_buffer_stream_unittest.cc
+++ b/media/filters/source_buffer_stream_unittest.cc
@@ -3679,6 +3679,19 @@ TEST_F(SourceBufferStreamTest, Audio_SpliceFrame_NoSplice) {
   CheckNoNextBuffer();
 }
 
+TEST_F(SourceBufferStreamTest, Audio_SpliceFrame_CorrectMediaSegmentStartTime) {
+  SetAudioStream();
+  Seek(0);
+  NewSegmentAppend("0K 2K 4K");
+  CheckExpectedRangesByTimestamp("{ [0,6) }");
+  NewSegmentAppend("6K 8K 10K");
+  CheckExpectedRangesByTimestamp("{ [0,12) }");
+  NewSegmentAppend("1K 4K");
+  CheckExpectedRangesByTimestamp("{ [0,12) }");
+  CheckExpectedBuffers("0K 2K 4K C 1K 4K 6K 8K 10K");
+  CheckNoNextBuffer();
+}
+
 // TODO(vrk): Add unit tests where keyframes are unaligned between streams.
 // (crbug.com/133557)