Add tests for vp9 (non-flexible mode) using different spatial and temporal configurations.

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

Index: webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
diff --git a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
index eba8dfb6b19e1d2d3b67072350d717e0ea4b4884..843116a7beadca4dda4445ab52d85b0cb0a2b921 100644
--- a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -316,6 +316,9 @@ int VP9EncoderImpl::InitEncode(const VideoCodec* inst,
   if (inst->codecSpecific.VP9.keyFrameInterval  > 0) {
     config_->kf_mode = VPX_KF_AUTO;
     config_->kf_max_dist = inst->codecSpecific.VP9.keyFrameInterval;
+    // Needs to be set (in svc mode) to get correct periodic key frame interval
+    // (will have no effect in non-svc).
+    config_->kf_min_dist = config_->kf_max_dist;
   } else {
     config_->kf_mode = VPX_KF_DISABLED;
   }