Add stats for average QP per frame for VP8 (for received video streams).

talk/app/webrtc/java/jni/androidmediaencoder_jni.cc

Index: talk/app/webrtc/java/jni/androidmediaencoder_jni.cc
diff --git a/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc b/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc
index d2ec5528341cf423233e2cc76d01bd4e395742f8..a9f20b328e4a6ccd1d31a01ac13d27d9c17e21cd 100644
--- a/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc
+++ b/talk/app/webrtc/java/jni/androidmediaencoder_jni.cc
@@ -795,8 +795,13 @@ bool MediaCodecVideoEncoder::DeliverPendingOutputs(JNIEnv* jni) {
         header.fragmentationLength[0] = image->_length;
         header.fragmentationPlType[0] = 0;
         header.fragmentationTimeDiff[0] = 0;
-        if (scale_)
-          quality_scaler_.ReportQP(webrtc::vp8::GetQP(payload));
+        if (scale_) {
+          int qp;
+          bool found = webrtc::vp8::GetQp(payload, payload_size, &qp);
+          RTC_DCHECK(found);
+          if (found)

[magjed_webrtc, 2015/10/20 13:17:20]

You shouldn't handle DCHECK failures. At least this is the case according to the
Chromium style guide:
https://www.chromium.org/developers/coding-style#TOC-CHECK-DCHECK-and-NOTREAC...

[åsapersson, 2015/10/20 13:52:36]

Ok. Removed check.

+            quality_scaler_.ReportQP(qp);
+        }
       } else if (codecType_ == kVideoCodecH264) {
         if (scale_) {
           h264_bitstream_parser_.ParseBitstream(payload, payload_size);