improve SetRate function
check the return value and reformat
improve the SetRates function to include updating frame rate
Merge branch 'openh264_integration_merge' into openh264_integration

Conflicts:
	media/webrtc/signaling/src/media-conduit/WebrtcOpenH264VideoCodec.cpp
Merge branch 'openh264_integration' into openh264_codectrace

Conflicts:
	media/webrtc/signaling/src/media-conduit/WebrtcOpenH264VideoCodec.cpp