Don't reconfigure the encoder if the video options aren't changing.

webrtc/media/engine/webrtcvideoengine2.cc

Index: webrtc/media/engine/webrtcvideoengine2.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2.cc b/webrtc/media/engine/webrtcvideoengine2.cc
index c6bdafee5a336666a4fd46f5aab78c0590525105..3844e3bc31a4c4ab80936712d0ac7514c9cb3571 100644
--- a/webrtc/media/engine/webrtcvideoengine2.cc
+++ b/webrtc/media/engine/webrtcvideoengine2.cc
@@ -1668,6 +1668,14 @@ WebRtcVideoChannel2::WebRtcVideoSendStream::GetSsrcs() const {
 void WebRtcVideoChannel2::WebRtcVideoSendStream::SetOptions(
     const VideoOptions& options) {
   rtc::CritScope cs(&lock_);
+
+  VideoOptions old_options = parameters_.options;
+  parameters_.options.SetAll(options);
+  // No need to do anything if the options aren't changing.
+  if (parameters_.options == old_options) {
+    return;
+  }
+
   if (parameters_.codec_settings) {
     LOG(LS_INFO) << "SetCodecAndOptions because of SetOptions; options="
                  << options.ToString();