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..de6ed0377d4a58179942b718d5c58f104c666daa 100644
--- a/webrtc/media/base/videocapturer.cc
+++ b/webrtc/media/base/videocapturer.cc
@@ -334,6 +334,16 @@ 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 (!IsScreencast() && video_adapter() && wants.resolution) {
+    video_adapter()->OnCpuResolutionRequest(
+        wants.resolution->request ==
+                rtc::VideoSinkWants::ResolutionRequest::kLargerThan
+            ? CoordinatedVideoAdapter::UPGRADE
+            : CoordinatedVideoAdapter::DOWNGRADE);
+  }
 }
 
 void VideoCapturer::OnFrameCaptured(VideoCapturer*,