Java VideoRenderer.Callbacks: Make renderFrame() interface asynchronous

This CL makes the Java render interface asynchronous by requiring every call to renderFrame() to be followed by an explicit renderFrameDone() call. In JNI, this is implemented with cricket::VideoFrame::Copy() before calling renderFrame(), and a corresponding call to delete in renderFrameDone(). This CL is primarily done to prepare for a new renderer implementation.

BUG=webrtc:4742, webrtc:4909
R=glaznev@webrtc.org

Review URL: https://codereview.webrtc.org/1313563002 .

Cr-Commit-Position: refs/heads/master@{#9814}
8 files changed