MediaCodecVideoEncoder: Add number of quality resolution downscales to Encoded callback.

BUG=

Review URL: https://codereview.webrtc.org/1426033002

Cr-Commit-Position: refs/heads/master@{#10453}
diff --git a/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc b/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc
index b0a6433..ac349e7 100644
--- a/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc
+++ b/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc
@@ -772,6 +772,8 @@
       image->_frameType =
           (key_frame ? webrtc::kVideoFrameKey : webrtc::kVideoFrameDelta);
       image->_completeFrame = true;
+      image->adapt_reason_.quality_resolution_downscales =
+          scale_ ? quality_scaler_.downscale_shift() : -1;
 
       webrtc::CodecSpecificInfo info;
       memset(&info, 0, sizeof(info));