Enabling spatial layers in VP9Impl. Filter layers in the loopback test.

webrtc/video/video_receive_stream.cc

Index: webrtc/video/video_receive_stream.cc
diff --git a/webrtc/video/video_receive_stream.cc b/webrtc/video/video_receive_stream.cc
index f91eac547b4a6da8b6a1d88404cfe8ce5fb7f43c..30c8128f238dc744dc8d647df30c48d7e12fd6c7 100644
--- a/webrtc/video/video_receive_stream.cc
+++ b/webrtc/video/video_receive_stream.cc
@@ -103,6 +103,8 @@ VideoCodec CreateDecoderVideoCodec(const VideoReceiveStream::Decoder& decoder) {
   strcpy(codec.plName, decoder.payload_name.c_str());
   if (decoder.payload_name == "VP8") {
     codec.codecType = kVideoCodecVP8;
+  } else if (decoder.payload_name == "VP9") {
+    codec.codecType = kVideoCodecVP9;
   } else if (decoder.payload_name == "H264") {
     codec.codecType = kVideoCodecH264;
   } else {
@@ -111,6 +113,8 @@ VideoCodec CreateDecoderVideoCodec(const VideoReceiveStream::Decoder& decoder) {
 
   if (codec.codecType == kVideoCodecVP8) {
     codec.codecSpecific.VP8 = VideoEncoder::GetDefaultVp8Settings();
+  } else if (codec.codecType == kVideoCodecVP9) {
+    codec.codecSpecific.VP9 = VideoEncoder::GetDefaultVp9Settings();
   } else if (codec.codecType == kVideoCodecH264) {
     codec.codecSpecific.H264 = VideoEncoder::GetDefaultH264Settings();
   }