Added url params arbr, asbr, vrbr & vsbr.

Added url params arbr, asbr, vrbr & vsbr to apprtc demo to control audio
and video send/receive bitrate.

BUG=3166
Modified apprtc code to handle url params arbr, asbr, vrbr & vsbr.

Follow up to the changes suggested by Justin/Ami.
More changes to apprtc code for handling  url params asbr, arbr, vsbr and vrbr.

Updated code, based on suggestions from Justin.
peerconnection-audio hangup listener fixed
Continuation to apprtc url params for adjusting bitrate.

Added nextMLineIndex as discussed with Justin to find the cline index
and bandwidth lines.
Final commit for adding url params to set audio/video bitrate in apprtc.

Minor change in for loop.
Merge pull request #7 from GoogleChrome/vikas_webrtc

Added url params arbr, asbr, vrbr & vsbr.
Removed stray .svn directories in apprtc
Add call setup time tracing.
Add more specific timing data to peerconnection sample.

Add enough traces to allow us to accurately determine how long it takes
to set up a call.
Add callbacks for ICE states and other changes useful for determining
timing.
Merge pull request #18 from juberti/apprtc4

Add call setup time tracing.
Remove http: scheme from googlefonts links to avoid HTTPS/HTTP mismatches.
Merge pull request #21 from fischman/master

Remove http: scheme from googlefonts links to avoid HTTPS/HTTP mismatches
Remove space
Curry callbacks, fix muting bug.
Try this
Doubles to single quotes
And that's why you always test your merge resolves
Merge pull request #19 from juberti/pc1

Add more specific timing data to peerconnection sample.
AppRTC speed + default HD

Turn on HD by default on Chrome desktop.
Turn on improved BWE by default.
Allow the start bitrate to be set from a URL param.
Allow the ICE transports value to be set from a URL param.
Speed up the call connect transition.
Rewrite a bunch of SDP-munging JS to be simpler.