Add cast_alsa_cma_backend_unittests to buildbot

chromecast/media/cma/backend/alsa/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("//build/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//media/media_options.gni")
 import("//testing/test.gni")
 
 declare_args() {
@@ skipping 52 matching lines @@
   ]
 }
 
 # GYP target: chromecast/media/media.gyp:chromecast_alsa_features
 buildflag_header("alsa_features") {
   header = "alsa_features.h"
 
   flags = [ "ALSA_MONOTONIC_RAW_TSTAMPS=$use_alsa_monotonic_raw_tstamps" ]
 }
 
-# GYP target: chromecast/media/media.gyp:alsa_cma_backend_unittests
-test("alsa_cma_backend_unittests") {
+# GYP target: chromecast/media/media.gyp:cast_alsa_cma_backend_unittests
+test("cast_alsa_cma_backend_unittests") {
   sources = [
     "stream_mixer_alsa_unittest.cc",
   ]
 
   deps = [
     ":test_support",
     "//base",
     "//base/test:run_all_unittests",
     "//chromecast/media/base",
     "//chromecast/media/base:libcast_media_1.0_default_core",
@@ skipping 16 matching lines @@
   public_deps = [
     ":alsa_cma_backend",
   ]
 
   deps = [
     "//base",
     "//media",
     "//testing/gmock",
   ]
 }