Set |_encodedWidth| and |_encodedHeight| in RtpFrameObject.
Set |_encodedWidth| and |_encodedHeight| in RtpFrameObject.

BUG=chromium:678080

Review-Url: https://codereview.webrtc.org/2622053003
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#16029}

ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc