Hook up EncodedVideoSource on the browser side

media/video/capture/linux/video_capture_device_linux.cc

Index: media/video/capture/linux/video_capture_device_linux.cc
diff --git a/media/video/capture/linux/video_capture_device_linux.cc b/media/video/capture/linux/video_capture_device_linux.cc
index 66f0ed7f8da097123be0cffbb386cb883efc389f..1f9757a23944ac83896eb9f0abb7567db5adfdc5 100644
--- a/media/video/capture/linux/video_capture_device_linux.cc
+++ b/media/video/capture/linux/video_capture_device_linux.cc
@@ -173,6 +173,14 @@ VideoCaptureDeviceLinux::~VideoCaptureDeviceLinux() {
   }
 }
 
+VideoEncodingCapability VideoCaptureDeviceLinux::GetEncodingCapability() {
+  return VideoEncodingCapability();
+}
+
+void VideoCaptureDeviceLinux::TryConfigureEncodedBitstream(
+    const RuntimeVideoEncodingParameters& params) {
+}
+
 void VideoCaptureDeviceLinux::Allocate(int width,
                                        int height,
                                        int frame_rate,