Extract common simulcast logic from VP8 wrapper and simulcast adapter

webrtc/modules/modules.gyp

 # Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [
@@ skipping 368 matching lines @@
             'video_coding/timing_unittest.cc',
             'video_coding/video_coding_robustness_unittest.cc',
             'video_coding/video_receiver_unittest.cc',
             'video_coding/video_sender_unittest.cc',
             'video_coding/qm_select_unittest.cc',
             'video_coding/test/stream_generator.cc',
             'video_coding/test/stream_generator.h',
             'video_coding/utility/frame_dropper_unittest.cc',
             'video_coding/utility/ivf_file_writer_unittest.cc',
             'video_coding/utility/quality_scaler_unittest.cc',
+            'video_coding/utility/simulcast_state_unittest.cc',
             'video_processing/test/content_metrics_test.cc',
             'video_processing/test/denoiser_test.cc',
             'video_processing/test/video_processing_unittest.cc',
             'video_processing/test/video_processing_unittest.h',
           ],
           'conditions': [
             ['enable_bwe_test_logging==1', {
               'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=1' ],
             }, {
               'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=0' ],
@@ skipping 372 matching lines @@
               'sources': [
                 'modules_unittests.isolate',
               ],
             },
           ],
         }],
       ],
     }], # include_tests
   ], # conditions
 }