Let ViEEncoder express resolution requests as Sinkwants.
This removes the VideoSendStream::LoadObserver interface and the implementation in WebrtcVideoSendStream and replace it with VideoSinkWants through the VideoSourceInterface.
To do that that, some stats for CPU adaptation is moved into VideoSendStream. Also handling of the CVO rtp header extension is moved to VideoSendStreamImpl.
BUG=webrtc:5687
TBR=mflodman@webrtc.org
Review-Url: https://codereview.webrtc.org/2304363002
Cr-Commit-Position: refs/heads/master@{#14877}
diff --git a/webrtc/test/constants.h b/webrtc/test/constants.h
index 14b2ba6..1b5b0cb 100644
--- a/webrtc/test/constants.h
+++ b/webrtc/test/constants.h
@@ -14,5 +14,6 @@
extern const int kTOffsetExtensionId;
extern const int kAbsSendTimeExtensionId;
extern const int kTransportSequenceNumberExtensionId;
+extern const int kVideoRotationExtensionId;
} // namespace test
} // namespace webrtc