Add a .gyp option to use dummy audio file devices.

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("../../build/webrtc.gni")
 
@@ skipping 76 matching lines @@
         "android/opensles_common.cc",
         "android/opensles_common.h",
         "android/opensles_player.cc",
         "android/opensles_player.h",
       ]
       libs = [
         "log",
         "OpenSLES",
       ]
     }
-    if (is_linux) {
-      sources += [
-        "linux/alsasymboltable_linux.cc",
-        "linux/alsasymboltable_linux.h",
-        "linux/audio_device_alsa_linux.cc",
-        "linux/audio_device_alsa_linux.h",
-        "linux/audio_mixer_manager_alsa_linux.cc",
-        "linux/audio_mixer_manager_alsa_linux.h",
-        "linux/latebindingsymboltable_linux.cc",
-        "linux/latebindingsymboltable_linux.h",
-      ]
-      defines += [ "LINUX_ALSA" ]
-      libs = [
-        "dl",
-        "X11",
-      ]
-      if (rtc_include_pulse_audio) {
+    if (rtc_use_dummy_audio_file_devices) {
+      defines += [ "WEBRTC_DUMMY_FILE_DEVICES" ]
+    } else {
+      if (is_linux) {
         sources += [
-          "linux/audio_device_pulse_linux.cc",
-          "linux/audio_device_pulse_linux.h",
-          "linux/audio_mixer_manager_pulse_linux.cc",
-          "linux/audio_mixer_manager_pulse_linux.h",
-          "linux/pulseaudiosymboltable_linux.cc",
-          "linux/pulseaudiosymboltable_linux.h",
+          "linux/alsasymboltable_linux.cc",
+          "linux/alsasymboltable_linux.h",
+          "linux/audio_device_alsa_linux.cc",
+          "linux/audio_device_alsa_linux.h",
+          "linux/audio_mixer_manager_alsa_linux.cc",
+          "linux/audio_mixer_manager_alsa_linux.h",
+          "linux/latebindingsymboltable_linux.cc",
+          "linux/latebindingsymboltable_linux.h",
         ]
-        defines += [ "LINUX_PULSE" ]
+        defines += [ "LINUX_ALSA" ]
+        libs = [
+          "dl",
+          "X11",
+        ]
+        if (rtc_include_pulse_audio) {
+          sources += [
+            "linux/audio_device_pulse_linux.cc",
+            "linux/audio_device_pulse_linux.h",
+            "linux/audio_mixer_manager_pulse_linux.cc",
+            "linux/audio_mixer_manager_pulse_linux.h",
+            "linux/pulseaudiosymboltable_linux.cc",
+            "linux/pulseaudiosymboltable_linux.h",
+          ]
+          defines += [ "LINUX_PULSE" ]
+        }
       }
-    }
-    if (is_mac) {
-      sources += [
-        "mac/audio_device_mac.cc",
-        "mac/audio_device_mac.h",
-        "mac/audio_mixer_manager_mac.cc",
-        "mac/audio_mixer_manager_mac.h",
-        "mac/portaudio/pa_memorybarrier.h",
-        "mac/portaudio/pa_ringbuffer.c",
-        "mac/portaudio/pa_ringbuffer.h",
-      ]
-      libs = [
-        "AudioToolbox.framework",
-        "CoreAudio.framework",
+      if (is_mac) {
+        sources += [
+          "mac/audio_device_mac.cc",
+          "mac/audio_device_mac.h",
+          "mac/audio_mixer_manager_mac.cc",
+          "mac/audio_mixer_manager_mac.h",
+          "mac/portaudio/pa_memorybarrier.h",
+          "mac/portaudio/pa_ringbuffer.c",
+          "mac/portaudio/pa_ringbuffer.h",
+        ]
+        libs = [
+          "AudioToolbox.framework",
+          "CoreAudio.framework",
 
-        # Needed for CGEventSourceKeyState in audio_device_mac.cc:
-        "CoreGraphics.framework",
-      ]
-    }
-    if (is_ios) {
-      public_deps = [
-        "../../sdk:rtc_sdk_common_objc",
-      ]
-      sources += [
-        "ios/audio_device_ios.h",
-        "ios/audio_device_ios.mm",
-        "ios/audio_device_not_implemented_ios.mm",
-        "ios/audio_session_observer.h",
-        "ios/objc/RTCAudioSession+Configuration.mm",
-        "ios/objc/RTCAudioSession+Private.h",
-        "ios/objc/RTCAudioSession.h",
-        "ios/objc/RTCAudioSession.mm",
-        "ios/objc/RTCAudioSessionConfiguration.h",
-        "ios/objc/RTCAudioSessionConfiguration.m",
-        "ios/objc/RTCAudioSessionDelegateAdapter.h",
-        "ios/objc/RTCAudioSessionDelegateAdapter.mm",
-        "ios/voice_processing_audio_unit.h",
-        "ios/voice_processing_audio_unit.mm",
-      ]
-      configs += [ "//build/config/compiler:enable_arc" ]
+          # Needed for CGEventSourceKeyState in audio_device_mac.cc:
+          "CoreGraphics.framework",
+        ]
+      }
+      if (is_ios) {
+        public_deps = [
+          "../../sdk:rtc_sdk_common_objc",
+        ]
+        sources += [
+          "ios/audio_device_ios.h",
+          "ios/audio_device_ios.mm",
+          "ios/audio_device_not_implemented_ios.mm",
+          "ios/audio_session_observer.h",
+          "ios/objc/RTCAudioSession+Configuration.mm",
+          "ios/objc/RTCAudioSession+Private.h",
+          "ios/objc/RTCAudioSession.h",
+          "ios/objc/RTCAudioSession.mm",
+          "ios/objc/RTCAudioSessionConfiguration.h",
+          "ios/objc/RTCAudioSessionConfiguration.m",
+          "ios/objc/RTCAudioSessionDelegateAdapter.h",
+          "ios/objc/RTCAudioSessionDelegateAdapter.mm",
+          "ios/voice_processing_audio_unit.h",
+          "ios/voice_processing_audio_unit.mm",
+        ]
+        configs += [ "//build/config/compiler:enable_arc" ]
 
-      libs = [
-        "AudioToolbox.framework",
-        "AVFoundation.framework",
-        "Foundation.framework",
-        "UIKit.framework",
-      ]
-    }
-    if (is_win) {
-      sources += [
-        "win/audio_device_core_win.cc",
-        "win/audio_device_core_win.h",
-        "win/audio_device_wave_win.cc",
-        "win/audio_device_wave_win.h",
-        "win/audio_mixer_manager_win.cc",
-        "win/audio_mixer_manager_win.h",
-      ]
-      libs = [
-        # Required for the built-in WASAPI AEC.
-        "dmoguids.lib",
-        "wmcodecdspuuid.lib",
-        "amstrmid.lib",
-        "msdmo.lib",
-      ]
+        libs = [
+          "AudioToolbox.framework",
+          "AVFoundation.framework",
+          "Foundation.framework",
+          "UIKit.framework",
+        ]
+      }
+      if (is_win) {
+        sources += [
+          "win/audio_device_core_win.cc",
+          "win/audio_device_core_win.h",
+          "win/audio_device_wave_win.cc",
+          "win/audio_device_wave_win.h",
+          "win/audio_mixer_manager_win.cc",
+          "win/audio_mixer_manager_win.h",
+        ]
+        libs = [
+          # Required for the built-in WASAPI AEC.
+          "dmoguids.lib",
+          "wmcodecdspuuid.lib",
+          "amstrmid.lib",
+          "msdmo.lib",
+        ]
+      }
     }
   } else {
     defines = [ "WEBRTC_DUMMY_AUDIO_BUILD" ]
   }
 
   if (!build_with_chromium) {
     sources += [
       # Do not link these into Chrome since they contain static data.
       "dummy/file_audio_device_factory.cc",
       "dummy/file_audio_device_factory.h",
     ]
   }
 
   configs += [ "../..:common_config" ]
   public_configs = [
     "../..:common_inherited_config",
     ":audio_device_config",
   ]
 
   if (is_clang) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }