Pass camera facing to WebKit

content/common/media/media_devices.h

Index: content/common/media/media_devices.h
diff --git a/content/common/media/media_devices.h b/content/common/media/media_devices.h
index 6ac1e2c5d7e5de67e65b00002ac59b7cb7a59ed9..c460f4da6eede02eb3cfe07d36664c0f6ffd0b5c 100644
--- a/content/common/media/media_devices.h
+++ b/content/common/media/media_devices.h
@@ -12,6 +12,7 @@
 
 namespace media {
 struct AudioDeviceDescription;
+struct VideoCaptureDeviceDescriptor;
 }
 
 namespace content {
@@ -24,16 +25,22 @@ enum MediaDeviceType {
 };
 
 struct CONTENT_EXPORT MediaDeviceInfo {
-  MediaDeviceInfo() = default;
+  MediaDeviceInfo();
+  MediaDeviceInfo(const MediaDeviceInfo& other);

[jochen (gone - plz use gerrit), 2017/01/12 11:54:42]

why do you need the copy ctor here?

[shenghao, 2017/01/13 11:09:34]

Required by chromium trybot checks. A complex class needs to have out-of-line
copy ctor

+  ~MediaDeviceInfo();
   MediaDeviceInfo(const std::string& device_id,
                   const std::string& label,
                   const std::string& group_id);

[jochen (gone - plz use gerrit), 2017/01/12 11:54:42]

this should also take the model_id 

[shenghao, 2017/01/13 11:09:34]

Not every media device has model_id. Ex. Audio devices using hdmi or bluetooth
do not have it.

   explicit MediaDeviceInfo(
       const media::AudioDeviceDescription& device_description);
 
+  explicit MediaDeviceInfo(
+      const media::VideoCaptureDeviceDescriptor& descriptor);
   std::string device_id;
   std::string label;
   std::string group_id;
+  // Format is "vid:pid". Ex. "E2A1:34D0".
+  std::string model_id;
 };
 
 using MediaDeviceInfoArray = std::vector<MediaDeviceInfo>;