With this cl, video buffers are now allocated using direct buffers.
These buffers are guaranteed to live as long as the capturer is running.
We can now post frames in c++ from the Java thread to the c++ worker thread and let c++ post the buffers back when it has finished
processing them.
This cl also reverts back to make Stop asynchronouse so that it is guaranteed that the c++ worker thread is not used and no frames are delivered to VideoCapturerAndroid after Stop completes.
BUG=4318
TESTED= On a N5, N6, N9 and Samsung device.
R=glaznev@webrtc.org, magjed@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/43369004
Cr-Commit-Position: refs/heads/master@{#8493}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8493 4adac7df-926f-26a2-2b94-8c16560cd09d
112f127170