TextRenderer only pushes new cues downstream

media/media.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 299 matching lines @@
         'base/simd/yuv_to_rgb_table.cc',
         'base/simd/yuv_to_rgb_table.h',
         'base/sinc_resampler.cc',
         'base/sinc_resampler.h',
         'base/stream_parser.cc',
         'base/stream_parser.h',
         'base/stream_parser_buffer.cc',
         'base/stream_parser_buffer.h',
         'base/text_cue.cc',
         'base/text_cue.h',
+        'base/text_ranges.cc',
+        'base/text_ranges.h',
         'base/text_renderer.cc',
         'base/text_renderer.h',
         'base/text_track.h',
         'base/text_track_config.cc',
         'base/text_track_config.h',
         'base/user_input_monitor.cc',
         'base/user_input_monitor.h',
         'base/user_input_monitor_linux.cc',
         'base/user_input_monitor_mac.cc',
         'base/user_input_monitor_win.cc',
@@ skipping 644 matching lines @@
         'base/multi_channel_resampler_unittest.cc',
         'base/pipeline_unittest.cc',
         'base/ranges_unittest.cc',
         'base/run_all_unittests.cc',
         'base/scoped_histogram_timer_unittest.cc',
         'base/serial_runner_unittest.cc',
         'base/seekable_buffer_unittest.cc',
         'base/sinc_resampler_unittest.cc',
         'base/test_data_util.cc',
         'base/test_data_util.h',
+        'base/text_ranges_unittest.cc',
         'base/text_renderer_unittest.cc',
         'base/user_input_monitor_unittest.cc',
         'base/vector_math_testing.h',
         'base/vector_math_unittest.cc',
         'base/video_frame_unittest.cc',
         'base/video_frame_pool_unittest.cc',
         'base/video_util_unittest.cc',
         'base/yuv_convert_unittest.cc',
         'cdm/aes_decryptor_unittest.cc',
         'cdm/json_web_key_unittest.cc',
@@ skipping 674 matching lines @@
                   ],
                 }],
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }