Make VideoSendStream/VideoReceiveStream configs const.

Benefits of this is that the send config previously had unclear locking
requirements, a lock was used to lock parts parts of it while
reconfiguring the VideoEncoder. Primary work was splitting out video
streams from config as well as encoder_settings as these change on
ReconfigureVideoEncoder. Now threading requirements for both member
configs are clear (as they are read-only), and encoder_settings doesn't
stay in the config as a stale pointer.

CreateVideoSendStream now takes video streams separately as well as the
encoder_settings pointer, analogous to ReconfigureVideoEncoder.

This change required changing so that pacing is silently enabled when
using suspend_below_min_bitrate rather than silently setting it.

R=henrik.lundin@webrtc.org, mflodman@webrtc.org, pthatcher@webrtc.org, stefan@webrtc.org
BUG=3260

Review URL: https://webrtc-codereview.appspot.com/20409004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6349 4adac7df-926f-26a2-2b94-8c16560cd09d

test/encoder_settings.h

diff --git a/test/encoder_settings.h b/test/encoder_settings.h
index 1d8e355..ea2be97 100644
--- a/test/encoder_settings.h
+++ b/test/encoder_settings.h
@@ -14,14 +14,10 @@
 
 namespace webrtc {
 namespace test {
-VideoSendStream::Config::EncoderSettings CreateEncoderSettings(
-    VideoEncoder* encoder,
-    const char* payload_name,
-    int payload_type,
-    size_t num_streams);
+std::vector<VideoStream> CreateVideoStreams(size_t num_streams);
 
 VideoCodec CreateDecoderVideoCodec(
-    const VideoSendStream::Config::EncoderSettings& settings);
+    const VideoSendStream::Config::EncoderSettings& encoder_settings);
 }  // namespace test
 }  // namespace webrtc