Added video capture capabilities retrieval and caching to VideoCaptureManager

media/video/capture/video_capture_device.cc

Index: media/video/capture/video_capture_device.cc
diff --git a/media/video/capture/video_capture_device.cc b/media/video/capture/video_capture_device.cc
index cd1f5354371433c2a07cc406a16b592e698aeca0..6f5212360cb1abe09565f0645e4e0393efc31df8 100644
--- a/media/video/capture/video_capture_device.cc
+++ b/media/video/capture/video_capture_device.cc
@@ -7,6 +7,13 @@
 
 namespace media {
 
+VideoCaptureDevice::Name::Name() {}
+
+VideoCaptureDevice::Name::Name(const std::string& name, const std::string& id)
+    : device_name_(name), unique_id_(id) {}
+
+VideoCaptureDevice::Name::~Name() {}
+
 const std::string VideoCaptureDevice::Name::GetNameAndModel() const {
   const std::string model_id = GetModel();
   if (model_id.empty())