Added Vp9 simulcast tests.

webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  *
  */
@@ skipping 233 matching lines @@
   }
   if (inst->width < 1 || inst->height < 1) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   if (number_of_cores < 1) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   if (inst->VP9().numberOfTemporalLayers > 3) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
-  // libvpx currently supports only one or two spatial layers.
-  if (inst->VP9().numberOfSpatialLayers > 2) {
+  // libvpx probably does not support more than 3 spatial layers.
+  if (inst->VP9().numberOfSpatialLayers > 3) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
 
   int ret_val = Release();
   if (ret_val < 0) {
     return ret_val;
   }
   if (encoder_ == NULL) {
     encoder_ = new vpx_codec_ctx_t;
     // Only randomize pid/tl0 the first time the encoder is initialized
@@ skipping 731 matching lines @@
   frame_buffer_pool_.ClearPool();
   inited_ = false;
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 const char* VP9DecoderImpl::ImplementationName() const {
   return "libvpx";
 }
 
 }  // namespace webrtc