[chromecast] Uses mock backend for MediaPipelineImplTest.

chromecast/media/BUILD.gn

 # Copyright 2015 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.
 
 import("//chromecast/chromecast.gni")
 import("//testing/test.gni")
 
 group("media") {
   public_deps = [
     "//chromecast/media/audio",
@@ skipping 19 matching lines @@
     "cma/base/multi_demuxer_stream_adapter_unittest.cc",
     "cma/pipeline/audio_video_pipeline_impl_unittest.cc",
     "cma/test/frame_generator_for_test.cc",
     "cma/test/frame_generator_for_test.h",
     "cma/test/frame_segmenter_for_test.cc",
     "cma/test/frame_segmenter_for_test.h",
     "cma/test/mock_frame_consumer.cc",
     "cma/test/mock_frame_consumer.h",
     "cma/test/mock_frame_provider.cc",
     "cma/test/mock_frame_provider.h",
+    "cma/test/mock_media_pipeline_backend.cc",
+    "cma/test/mock_media_pipeline_backend.h",
     "cma/test/run_all_unittests.cc",
   ]
 
   deps = [
     ":media",
     "//base",
     "//base:i18n",
     "//base/test:test_support",
     "//chromecast/base",
     "//chromecast/base/metrics:test_support",
@@ skipping 37 matching lines @@
     "//testing/gmock",
     "//testing/gtest",
   ]
 
   if (chromecast_branding == "public") {
     # Link default libcast_media_1.0 statically not to link dummy one
     # dynamically for public unittests.
     deps += [ "//chromecast/media/base:libcast_media_1.0_default_core" ]
   }
 }