Let ViEEncoder handle resolution changes.

webrtc/test/frame_generator_capturer.cc

Index: webrtc/test/frame_generator_capturer.cc
diff --git a/webrtc/test/frame_generator_capturer.cc b/webrtc/test/frame_generator_capturer.cc
index 7e929095f048a7876569affb59a7fa6fea39e5ab..d80154a8de591f305b0286aa21b187e2bc6f2bd1 100644
--- a/webrtc/test/frame_generator_capturer.cc
+++ b/webrtc/test/frame_generator_capturer.cc
@@ -124,6 +124,11 @@ void FrameGeneratorCapturer::Stop() {
   sending_ = false;
 }
 
+void FrameGeneratorCapturer::ChangeResolution(size_t width, size_t height) {
+  rtc::CritScope cs(&lock_);
+  frame_generator_->ChangeResolution(width, height);
+}
+
 void FrameGeneratorCapturer::AddOrUpdateSink(
     rtc::VideoSinkInterface<VideoFrame>* sink,
     const rtc::VideoSinkWants& wants) {