Remove internal codecs from VideoSendStream.

Replaces VideoCodec in VideoSendStream::Config with an EncoderSettings
struct. The EncoderSettings struct uses an external encoder for all
codecs. This means that external users, such as libjingle, will provide
the encoders themselves, removing the previous distinction of internal
and external codecs.

For now VideoSendStream translates to VideoCodec internally. In the
interrim (before the corresponding change is implemented in
VideoReceiveStream) tests convert EncoderSettings to VideoCodecs.

Removes Call::GetVideoCodecs().

Disables RampUpTest.WithPacingAndRtx as its further exposed with changes
to bitrates used in tests.

BUG=2854,2992
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/7919004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5722 4adac7df-926f-26a2-2b94-8c16560cd09d
Simplify pacer interface.

New interface uses two bitrates (max/min). The pace multiplier is also
removed from the interface and instead utilized outside. Min bitrate
will be filled with padding if there's not enough media to transmit.

Also fixes a bug in minimum transmission bitrate that made it ignore
REMBs. A regression test has been added to catch it.

BUG=3014
R=mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/10059004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5723 4adac7df-926f-26a2-2b94-8c16560cd09d
Disable flaky CanSwitchToUseAllSsrcs.

Test flakes on bots, disabling while investigating.

R=minyue@webrtc.org
TBR=mflodman@webrtc.org
BUG=3078

Review URL: https://webrtc-codereview.appspot.com/10119006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5724 4adac7df-926f-26a2-2b94-8c16560cd09d
Changing the buffer size (in packets) to 1.5 seconds @ 30 ms packets

BUG=2935
R=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/9899004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5725 4adac7df-926f-26a2-2b94-8c16560cd09d
Revert "Changing the buffer size (in packets) to 1.5 seconds @ 30 ms packets"

Build bots turned red.

TBR=tina.legrand@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/10229004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5726 4adac7df-926f-26a2-2b94-8c16560cd09d