Change VCM interface to take target bitrate in bits per second.

This also solves issue 1469.

TESTS=trybots
BUG=1469

Review URL: https://webrtc-codereview.appspot.com/1215004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3681 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/main/source/generic_encoder.h

@@ -105,10 +105,11 @@ public:
                          const CodecSpecificInfo* codecSpecificInfo,
                          const std::vector<FrameType>& frameTypes);
     /**
-    *	Set new target bit rate and frame rate
-    * Return Value: new bit rate if OK, otherwise <0s
+    * Set new target bitrate (bits/s) and framerate.
+    * Return Value: new bit rate if OK, otherwise <0s.
     */
-    WebRtc_Word32 SetRates(WebRtc_UWord32 newBitRate, WebRtc_UWord32 frameRate);
+    WebRtc_Word32 SetRates(WebRtc_UWord32 target_bitrate,
+                           WebRtc_UWord32 frameRate);
     /**
     * Set a new packet loss rate and a new round-trip time in milliseconds.
     */