Reland of Enabling `gn check` on webrtc/test

webrtc/modules/audio_device/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("../../webrtc.gni")
 
@@ skipping 236 matching lines @@
   if (is_win) {
     cflags = [
       # TODO(phoglund): get rid of 4373 supression when
       # http://code.google.com/p/webrtc/issues/detail?id=261 is solved.
       # legacy warning for ignoring const / volatile in signatures.
       "/wd4373",
     ]
   }
 }
 
+rtc_source_set("mock_audio_device") {
+  testonly = true
+  sources = [
+    "include/mock_audio_device.h",
+    "include/mock_audio_transport.h",
+  ]
+  deps = [
+    ":audio_device",
+    "../../test:test_support",
+  ]
+  all_dependent_configs = [ ":mock_audio_device_config" ]
+}
+
 if (rtc_include_tests) {
   rtc_source_set("audio_device_unittests") {
     testonly = true
 
     # Skip restricting visibility on mobile platforms since the tests on those
     # gets additional generated targets which would require many lines here to
     # cover (which would be confusing to read and hard to maintain).
     if (!is_android && !is_ios) {
       visibility = [ "//webrtc/modules:modules_unittests" ]
     }
@@ skipping 35 matching lines @@
         sources += [ "ios/audio_device_unittest_ios.mm" ]
       }
       deps += [ "//third_party/ocmock" ]
     }
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 
-  rtc_source_set("mock_audio_device") {
-    testonly = true
-    sources = [
-      "include/mock_audio_device.h",
-      "include/mock_audio_transport.h",
-    ]
-    deps = [
-      ":audio_device",
-      "../../test:test_support",
-    ]
-    all_dependent_configs = [ ":mock_audio_device_config" ]
-  }
-
   if (!is_ios) {
     # These tests do not work on ios, see
     # https://bugs.chromium.org/p/webrtc/issues/detail?id=4755
     rtc_executable("audio_device_tests") {
       testonly = true
       sources = [
         "test/audio_device_test_api.cc",
         "test/audio_device_test_defines.h",
       ]
       deps = [
@@ skipping 20 matching lines @@
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java",
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioRecord.java",
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioTrack.java",
       "android/java/src/org/webrtc/voiceengine/WebRtcAudioUtils.java",
     ]
     deps = [
       "//webrtc/base:base_java",
     ]
   }
 }