Fix MP4StreamParser discard behavior when retaining 'moof'.

media/mp4/mp4_stream_parser_unittest.cc

Index: media/mp4/mp4_stream_parser_unittest.cc
diff --git a/media/mp4/mp4_stream_parser_unittest.cc b/media/mp4/mp4_stream_parser_unittest.cc
index 56f40dfaf74012b7627892f7b772c5dfdd65b738..6b4f4caa73b1302d26aa2a8f7ad3c62322ecee28 100644
--- a/media/mp4/mp4_stream_parser_unittest.cc
+++ b/media/mp4/mp4_stream_parser_unittest.cc
@@ -120,14 +120,17 @@ class MP4StreamParserTest : public testing::Test {
   }
 };
 
-
-
 TEST_F(MP4StreamParserTest, TestUnalignedAppend) {
   // Test small, non-segment-aligned appends (small enough to exercise
   // incremental append system)
   ParseMP4File("bear.1280x720_dash.mp4", 512);
 }
 
+TEST_F(MP4StreamParserTest, TestBytewiseAppend) {
+  // Ensure no incremental errors occur when parsing
+  ParseMP4File("bear.1280x720_dash.mp4", 1);
+}
+
 TEST_F(MP4StreamParserTest, TestMultiFragmentAppend) {
   // Large size ensures multiple fragments are appended in one call (size is
   // larger than this particular test file)
@@ -147,5 +150,8 @@ TEST_F(MP4StreamParserTest, TestReinitialization) {
                                  512));
 }
 
+// TODO(strobe): Create and test media which uses CENC auxiliary info stored
+// inside a private box
+
 }  // namespace mp4
 }  // namespace media