Memset svc_params in vp9 wrapper to avoid undefined behavior.

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 63 matching lines @@
       raw_(NULL),
       input_image_(NULL),
       tl0_pic_idx_(0),
       frames_since_kf_(0),
       num_temporal_layers_(0),
       num_spatial_layers_(0),
       frames_encoded_(0),
       // Use two spatial when screensharing with flexible mode.
       spatial_layer_(new ScreenshareLayersVP9(2)) {
   memset(&codec_, 0, sizeof(codec_));
+  memset(&svc_internal_.svc_params, 0, sizeof(vpx_svc_extra_cfg_t));
   uint32_t seed = rtc::Time32();
   srand(seed);
 }
 
 VP9EncoderImpl::~VP9EncoderImpl() {
   Release();
 }
 
 int VP9EncoderImpl::Release() {
   if (encoded_image_._buffer != NULL) {
@@ skipping 897 matching lines @@
   frame_buffer_pool_.ClearPool();
   inited_ = false;
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 const char* VP9DecoderImpl::ImplementationName() const {
   return "libvpx";
 }
 
 }  // namespace webrtc