Screen content simulcast layers should not be downscaled.

webrtc/media/engine/webrtcvideoengine2_unittest.cc

 /*
  *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 4106 matching lines @@
     EXPECT_TRUE(capturer.CaptureFrame());
 
     std::vector<webrtc::VideoStream> video_streams = stream->GetVideoStreams();
     ASSERT_EQ(expected_num_streams, video_streams.size());
 
     std::vector<webrtc::VideoStream> expected_streams;
     if (conference_mode) {
       expected_streams = GetSimulcastConfig(
           num_configured_streams, capture_width, capture_height, 0,
           kDefaultQpMax, kDefaultVideoMaxFramerate, screenshare);
+      if (screenshare) {
+        for (const webrtc::VideoStream& stream : expected_streams) {
+          // Never scale screen content.
+          EXPECT_EQ(stream.width, capture_width);
+          EXPECT_EQ(stream.height, capture_height);
+        }
+      }
     } else {
       webrtc::VideoStream stream;
       stream.width = capture_width;
       stream.height = capture_height;
       stream.max_framerate = kDefaultVideoMaxFramerate;
       stream.min_bitrate_bps = cricket::kMinVideoBitrateKbps * 1000;
       int max_bitrate_kbps;
       if (capture_width * capture_height <= 320 * 240) {
         max_bitrate_kbps = 600;
       } else if (capture_width * capture_height <= 640 * 480) {
@@ skipping 118 matching lines @@
 }
 
 TEST_F(WebRtcVideoChannel2SimulcastTest, SetSendCodecsForSimulcastScreenshare) {
   webrtc::test::ScopedFieldTrials override_field_trials_(
       "WebRTC-SimulcastScreenshare/Enabled/");
   VerifySimulcastSettings(cricket::VideoCodec("VP8"), 1280, 720, 3, 2, true,
                           true);
 }
 
 }  // namespace cricket