merge from ayang
temp fix to ayang's patch for passing the build
stagefright OMX codec wrapper.
AAC/AVC track encoders on top of stagefright codec wrapper.
debug only - write MP4 files for verification
WIP: enable unit tests on B2G.
Temporary patch: disable content process permission check for camera & PSM.
[WIP] Bug 911046 - WebRTC OmxCodec coding path support.
 This version requires changes in Android stagefright to work.
 See https://github.com/jhlin/platform_frameworks_av
[WIP] Bug 911046 - WebRTC OmxCodec coding path support.
- Add functions to support sending decoded frames for rendering directly
- Remove previous dirty hack to webrtc.org source since it's not needed anymore
temp fix to workaround mic & e10s UDP failures.