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The new test is based upon the exisiting rampup test, but also adds a low-rate period. The main purpose of the test is to verify the SuspendBelowMinBitrate functionality, which must be enabled for the test to pass. The CL also adds a change to the min bitrate in the send-side bandwidth estimator when SuspendBelowMinBitrate is enabled. An anonymous namespace is added around the StreamObserver classes in the test to avoid silent linker conflicts that could happen otherwise. Note: this CL depends on https://webrtc-codereview.appspot.com/9049004/ BUG=2636 R=stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/9059004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5646 4adac7df-926f-26a2-2b94-8c16560cd09d