Pass camera facing info to audio client

media/capture/BUILD.gn

 # Copyright 2016 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/config/features.gni")
 import("//media/media_options.gni")
 import("//testing/test.gni")
 
 component("capture") {
   defines = [ "CAPTURE_IMPLEMENTATION" ]
@@ skipping 22 matching lines @@
     "video/linux/camera_config_chromeos.cc",
     "video/linux/camera_config_chromeos.h",
     "video/linux/v4l2_capture_delegate.cc",
     "video/linux/v4l2_capture_delegate.h",
     "video/linux/video_capture_device_chromeos.cc",
     "video/linux/video_capture_device_chromeos.h",
     "video/linux/video_capture_device_factory_linux.cc",
     "video/linux/video_capture_device_factory_linux.h",
     "video/linux/video_capture_device_linux.cc",
     "video/linux/video_capture_device_linux.h",
+    "video/linux/video_capture_observer_chromeos.cc",
+    "video/linux/video_capture_observer_chromeos.h",
     "video/mac/video_capture_device_avfoundation_mac.h",
     "video/mac/video_capture_device_avfoundation_mac.mm",
     "video/mac/video_capture_device_decklink_mac.h",
     "video/mac/video_capture_device_decklink_mac.mm",
     "video/mac/video_capture_device_factory_mac.h",
     "video/mac/video_capture_device_factory_mac.mm",
     "video/mac/video_capture_device_mac.h",
     "video/mac/video_capture_device_mac.mm",
     "video/scoped_result_callback.h",
     "video/shared_memory_buffer_tracker.cc",
@@ skipping 140 matching lines @@
       "//media/capture/video/android",
       "//media/capture/video/android:capture_java",
     ]
   }
 
   if (is_win) {
     # TODO(jschuh): https://crbug.com/167187 fix size_t to int truncations.
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
 }