VP9: Enable static threshold for non-screen content.

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 2e9f5ae30f6ca8e21fcb4bd9c9c0a87a8bb2d9a5..0c4dee71bb9800463bbf839c1ae029fd8e6d6beb 100644
--- a/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
+++ b/webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc
@@ -402,10 +402,9 @@ int VP9EncoderImpl::InitAndSetControlSettings(const VideoCodec* inst) {
   if (codec_.mode == kScreensharing) {
     // Adjust internal parameters to screen content.
     vpx_codec_control(encoder_, VP9E_SET_TUNE_CONTENT, 1);
-    // Let the encoder skip the encoding of very flat/low content blocks.
-    vpx_codec_control(encoder_, VP8E_SET_STATIC_THRESHOLD, 1);
   }
-
+  // Enable encoder skip of static/low content blocks.
+  vpx_codec_control(encoder_, VP8E_SET_STATIC_THRESHOLD, 1);
   inited_ = true;
   return WEBRTC_VIDEO_CODEC_OK;
 }