Bug: webm:1833
Change-Id: I7e6e1da7965f098c8b62c55a09619d0bf703b516
Various new features for rate control library for real-time: SVC parallel
encoding, loopfilter level, support for frame dropping, and screen content.
+ New callback function send_tpl_gop_stats for vp9 external rate control
+ library, which can be used to transmit TPL stats for a group of pictures. A
+ public header vpx_tpl.h is added for the definition of TPL stats used in
+ this callback.
+
libwebm is upgraded to libwebm-1.0.0.29-9-g1930e3c.
- Enhancement: