Respect VP8.automaticResizeOn for MediaCodec.

Disables QualityScaler for screenshare-type content and simulcast inside
MediaCodecVideoEncoder.

BUG=
R=glaznev@webrtc.org

Review URL: https://codereview.webrtc.org/2107233003 .

Cr-Commit-Position: refs/heads/master@{#13347}
diff --git a/webrtc/api/java/jni/androidmediaencoder_jni.cc b/webrtc/api/java/jni/androidmediaencoder_jni.cc
index 49a3fb8..2c50fe5 100644
--- a/webrtc/api/java/jni/androidmediaencoder_jni.cc
+++ b/webrtc/api/java/jni/androidmediaencoder_jni.cc
@@ -382,7 +382,14 @@
   codec_mode_ = codec_settings->mode;
   int init_width = codec_settings->width;
   int init_height = codec_settings->height;
-  scale_ = codecType_ != kVideoCodecVP9;
+  // Scaling is disabled for VP9, but optionally enabled for VP8.
+  // TODO(pbos): Extract automaticResizeOn out of VP8 settings.
+  scale_ = false;
+  if (codecType_ == kVideoCodecVP8) {
+    scale_ = codec_settings->codecSpecific.VP8.automaticResizeOn;
+  } else if (codecType_ != kVideoCodecVP9) {
+    scale_ = true;
+  }
 
   ALOGD << "InitEncode request: " << init_width << " x " << init_height;
   ALOGD << "Encoder automatic resize " << (scale_ ? "enabled" : "disabled");