Move direct use of VideoCapturer::VideoAdapter to VideoSinkWants.

webrtc/media/base/videocapturer.cc

Index: webrtc/media/base/videocapturer.cc
diff --git a/webrtc/media/base/videocapturer.cc b/webrtc/media/base/videocapturer.cc
index 2d6a15e544046e3ee768ae7b39e4c8a18251cca0..c83448dcd35e3b8556118d20b053780329b23b91 100644
--- a/webrtc/media/base/videocapturer.cc
+++ b/webrtc/media/base/videocapturer.cc
@@ -334,6 +334,18 @@ void VideoCapturer::OnSinkWantsChanged(const rtc::VideoSinkWants& wants) {
   if (frame_factory_) {
     frame_factory_->SetApplyRotation(apply_rotation_);
   }
+
+  // Do not adapt resolution for screen content as this will likely result in
+  // blurry and unreadable text.
+  if (wants.resolution_request.change !=
+          rtc::VideoSinkWants::ResolutionRequest::NONE &&
+      !IsScreencast() && video_adapter()) {
+    video_adapter()->OnCpuResolutionRequest(
+        wants.resolution_request.change ==
+                rtc::VideoSinkWants::ResolutionRequest::DOWN
+            ? CoordinatedVideoAdapter::DOWNGRADE
+            : CoordinatedVideoAdapter::UPGRADE);
+  }
 }
 
 void VideoCapturer::OnFrameCaptured(VideoCapturer*,