Make sure WebRTC works without libvpx VP9 support.

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 45 matching lines @@
       },
       'targets': [
         {
           'target_name': 'modules_tests',
           'type': '<(gtest_target_type)',
           'dependencies': [
             '<(DEPTH)/testing/gtest.gyp:gtest',
             '<(webrtc_root)/common.gyp:webrtc_common',
             '<(webrtc_root)/common_video/common_video.gyp:common_video',
             '<(webrtc_root)/modules/video_coding/codecs/vp8/vp8.gyp:webrtc_vp8',
-            '<(webrtc_root)/modules/video_coding/codecs/vp9/vp9.gyp:webrtc_vp9',

[kjellander_webrtc, 2016/05/13 05:26:15]

Shouldn't this also go into the condition?

[pbos-webrtc, 2016/05/14 00:03:06]

No this target doesn't use vp9 at all (modules_unittests below does and includes
webrtc_vp9 unconditionally).

             '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
             '<(webrtc_root)/test/metrics.gyp:metrics',
             '<(webrtc_root)/test/test.gyp:test_support',
             '<(webrtc_root)/test/test.gyp:test_support_main',
             'audio_coding_module',
             'rtp_rtcp',
             'video_codecs_test_framework',
             'webrtc_utility',
             'webrtc_video_coding',
           ],
@@ skipping 279 matching lines @@
             'utility/source/process_thread_impl_unittest.cc',
             'video_coding/codecs/test/packet_manipulator_unittest.cc',
             'video_coding/codecs/test/stats_unittest.cc',
             'video_coding/codecs/test/videoprocessor_unittest.cc',
             'video_coding/codecs/vp8/default_temporal_layers_unittest.cc',
             'video_coding/codecs/vp8/reference_picture_selection_unittest.cc',
             'video_coding/codecs/vp8/screenshare_layers_unittest.cc',
             'video_coding/codecs/vp8/simulcast_encoder_adapter_unittest.cc',
             'video_coding/codecs/vp8/simulcast_unittest.cc',
             'video_coding/codecs/vp8/simulcast_unittest.h',
-            'video_coding/codecs/vp9/screenshare_layers_unittest.cc',
             'video_coding/include/mock/mock_vcm_callbacks.h',
             'video_coding/decoding_state_unittest.cc',
             'video_coding/histogram_unittest.cc',
             'video_coding/jitter_buffer_unittest.cc',
             'video_coding/jitter_estimator_tests.cc',
             'video_coding/media_optimization_unittest.cc',
             'video_coding/nack_module_unittest.cc',
             'video_coding/packet_buffer_unittest.cc',
             'video_coding/percentile_filter_unittest.cc',
             'video_coding/receiver_unittest.cc',
             'video_coding/session_info_unittest.cc',
             'video_coding/sequence_number_util_unittest.cc',
             '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/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_processing/test/denoiser_test.cc',
             'video_processing/test/video_processing_unittest.cc',
             'video_processing/test/video_processing_unittest.h',
           ],
           'conditions': [
+            ['libvpx_build_vp9==1', {
+              'sources': [
+                'video_coding/codecs/vp9/screenshare_layers_unittest.cc',
+              ],
+            }],
             ['enable_bwe_test_logging==1', {
               'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=1' ],
             }, {
               'defines': [ 'BWE_TEST_LOGGING_COMPILE_TIME_ENABLE=0' ],
               'sources!': [
                 'remote_bitrate_estimator/test/bwe_test_logging.cc'
               ],
             }],
             # Run screen/window capturer tests only on platforms where they are
             # supported.
@@ skipping 366 matching lines @@
               'sources': [
                 'modules_unittests.isolate',
               ],
             },
           ],
         }],
       ],
     }], # include_tests
   ], # conditions
 }