Update screen simulcast config and fix periodic encoder param update

webrtc/test/fake_encoder.h

Index: webrtc/test/fake_encoder.h
diff --git a/webrtc/test/fake_encoder.h b/webrtc/test/fake_encoder.h
index c07fbb36e1c49088e343d0f048b90359e0f651f1..906206983e2913bb978a3574d435a8e241d3b85e 100644
--- a/webrtc/test/fake_encoder.h
+++ b/webrtc/test/fake_encoder.h
@@ -45,6 +45,7 @@ class FakeEncoder : public VideoEncoder {
   int32_t SetRateAllocation(const BitrateAllocation& rate_allocation,
                             uint32_t framerate) override;
   const char* ImplementationName() const override;
+  int GetConfiguredInputFramerate();
 
   static const char* kImplementationName;
 
@@ -53,6 +54,7 @@ class FakeEncoder : public VideoEncoder {
   VideoCodec config_ GUARDED_BY(crit_sect_);
   EncodedImageCallback* callback_ GUARDED_BY(crit_sect_);
   BitrateAllocation target_bitrate_ GUARDED_BY(crit_sect_);
+  int configured_input_framerate_ GUARDED_BY(crit_sect_);
   int max_target_bitrate_kbps_ GUARDED_BY(crit_sect_);
   int64_t last_encode_time_ms_ GUARDED_BY(crit_sect_);
   rtc::CriticalSection crit_sect_;