Add support for facingMode in MediaStreamTrack.getSettings() on Android.

content/renderer/media/media_stream_video_track.cc

 // Copyright 2013 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.
 
 #include "content/renderer/media/media_stream_video_track.h"
 
+#include <string>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "build/build_config.h"
 #include "content/renderer/media/media_stream_constraints_util_video_device.h"
 #include "media/capture/video_capture_types.h"
 
 namespace content {
 
 namespace {
 void ResetCallback(std::unique_ptr<VideoCaptureDeliverFrameCB> callback) {
   // |callback| will be deleted when this exits.
 }
 
@@ skipping 394 matching lines @@
       settings.facing_mode = blink::WebMediaStreamTrack::FacingMode::kUser;
       break;
     case media::MEDIA_VIDEO_FACING_ENVIRONMENT:
       settings.facing_mode =
           blink::WebMediaStreamTrack::FacingMode::kEnvironment;
       break;
     default:
       settings.facing_mode = blink::WebMediaStreamTrack::FacingMode::kNone;
       break;
   }
+#if defined(OS_ANDROID)
+  // On Android, the facing mode is not available in the |facing| field,

[hbos_chromium, 2017/07/05 10:21:04]

nit: video_facing field

[Guido Urdaneta, 2017/07/06 08:20:16]

Done.

+  // but is available as part of the label.
+  // TODO(guidou): Remove this code once the |facing| field is supported
+  // on Android. See http://crbug.com/672856.
+  if (source_->device_info().device.name.find("front") != std::string::npos) {
+    settings.facing_mode = blink::WebMediaStreamTrack::FacingMode::kUser;
+  } else if (source_->device_info().device.name.find("back") !=
+             std::string::npos) {
+    settings.facing_mode = blink::WebMediaStreamTrack::FacingMode::kEnvironment;
+  }
+#endif
+
   const base::Optional<CameraCalibration> calibration =
       source_->device_info().device.camera_calibration;
   if (calibration) {
     settings.depth_near = calibration->depth_near;
     settings.depth_far = calibration->depth_far;
     settings.focal_length_x = calibration->focal_length_x;
     settings.focal_length_y = calibration->focal_length_y;
   }
 }
 
 void MediaStreamVideoTrack::OnReadyStateChanged(
     blink::WebMediaStreamSource::ReadyState state) {
   DCHECK(main_render_thread_checker_.CalledOnValidThread());
   for (auto* sink : sinks_)
     sink->OnReadyStateChanged(state);
 }
 
 }  // namespace content