Pass camera facing info to audio client

content/browser/renderer_host/media/video_capture_manager.cc

Index: content/browser/renderer_host/media/video_capture_manager.cc
diff --git a/content/browser/renderer_host/media/video_capture_manager.cc b/content/browser/renderer_host/media/video_capture_manager.cc
index 24880a5759a4fb77c265057242bd5fb93c51fed1..651fc0e9a0be85230049ded17037fd0ea2cb0aec 100644
--- a/content/browser/renderer_host/media/video_capture_manager.cc
+++ b/content/browser/renderer_host/media/video_capture_manager.cc
@@ -34,6 +34,7 @@
 #include "content/public/common/media_stream_request.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/media_switches.h"
+#include "media/base/video_facing.h"
 #include "media/capture/video/video_capture_buffer_pool_impl.h"
 #include "media/capture/video/video_capture_buffer_tracker_factory_impl.h"
 #include "media/capture/video/video_capture_device.h"
@@ -335,10 +336,12 @@ VideoCaptureManager::CaptureDeviceStartRequest::CaptureDeviceStartRequest(
 }
 
 VideoCaptureManager::VideoCaptureManager(
-    std::unique_ptr<media::VideoCaptureDeviceFactory> factory)
+    std::unique_ptr<media::VideoCaptureDeviceFactory> factory,
+    component::VideoCaptureOberser observer)
     : listener_(nullptr),
       new_capture_session_id_(1),
-      video_capture_device_factory_(std::move(factory)) {}
+      video_capture_device_factory_(std::move(factory)),
+      capture_observer_(observer) {}
 
 VideoCaptureManager::~VideoCaptureManager() {
   DCHECK(devices_.empty());
@@ -653,6 +656,24 @@ VideoCaptureManager::DoStartDeviceCaptureOnDeviceThread(
     return nullptr;
   }
 
+  if (capture_observer_ != NULL) {
+    component::VideoFacingMode facing =
+        component::VideoFacingMode::NONE;
+    switch (descriptor.facing) {
+      case media::MEDIA_VIDEO_FACING_NONE:
+      case media::NUM_MEDIA_VIDEO_FACING_MODE:
+        facing = component::VideoFacingMode::NONE;
+        break;
+      case media::MEDIA_VIDEO_FACING_USER:
+        facing = component::VideoFacingMode::USER;
+        break;
+      case media::MEDIA_VIDEO_FACING_ENVIRONMENT:
+        facing = component::VideoFacingMode::ENVIRONMENT;
+        break;
+    }
+    capture_observer_->OnVideoCaptureStarted(facing);

[chfremer, 2017/01/20 18:23:53]

Where will we call OnVideoCaptureStopped()?

[shenghao, 2017/01/24 12:52:01]

Oh I forgot to add it.

+  }
+
   video_capture_device->AllocateAndStart(params, std::move(device_client));
   return video_capture_device;
 }