Move min transmit bitrate to VideoEncoderConfig.

min_transmit_bitrate_bps needs to be reconfigurable during a call (since
this is currently set only for screensharing through libjingle and can't
be set once and for all for the entire Call.

R=mflodman@webrtc.org, stefan@webrtc.org
BUG=1667

Review URL: https://webrtc-codereview.appspot.com/28779004

git-svn-id: http://webrtc.googlecode.com/svn@7518 4adac7df-926f-26a2-2b94-8c16560cd09d
Adding the subtool rtcBot report visualizer

This tool for visualize the output reports of rtcBot by calculating
the average and max of a specific stats and plot the output.

R=andresp@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/23169004

git-svn-id: http://webrtc.googlecode.com/svn@7519 4adac7df-926f-26a2-2b94-8c16560cd09d
Add HD support to Android if we detect a hardware video encoder that can be used. This Change the internal class MediaCodecVideoEncoder to have a one public method for checking if the platform is supported. It also adds &hd=true to the reqest url a hardware encoder is detected.

BUG=3934
R=glaznev@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/30749004

git-svn-id: http://webrtc.googlecode.com/svn@7520 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 78427027-> 78430441

git-svn-id: http://webrtc.googlecode.com/svn@7521 4adac7df-926f-26a2-2b94-8c16560cd09d
(Auto)update libjingle 78430441-> 78445452

git-svn-id: http://webrtc.googlecode.com/svn@7522 4adac7df-926f-26a2-2b94-8c16560cd09d