Hook up EncodedVideoSource on the browser side

media/video/capture/video_capture_device_dummy.cc

Index: media/video/capture/video_capture_device_dummy.cc
diff --git a/media/video/capture/video_capture_device_dummy.cc b/media/video/capture/video_capture_device_dummy.cc
index 8d0355d122f300e3c9c3ba48ce1f6e49d4cbf597..16281198cc1bb3e5c9c7fa0c718953e37c708454 100644
--- a/media/video/capture/video_capture_device_dummy.cc
+++ b/media/video/capture/video_capture_device_dummy.cc
@@ -16,6 +16,14 @@ VideoCaptureDeviceDummy::VideoCaptureDeviceDummy() {}
 
 VideoCaptureDeviceDummy::~VideoCaptureDeviceDummy() {}
 
+VideoEncodingCapability VideoCaptureDeviceDummy::GetEncodingCapability() {
+  return VideoEncodingCapability();
+}
+
+void VideoCaptureDeviceDummy::TryConfigureEncodedBitstream(
+    const RuntimeVideoEncodingParameters& params) {
+}
+
 void VideoCaptureDeviceDummy::Allocate(
     int width, int height, int frame_rate,
     VideoCaptureDevice::EventHandler* observer) {}