Disable frame dropper for screenshare mode.

BUG=1466

Review URL: https://webrtc-codereview.appspot.com/1170004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3629 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/utility/include/frame_dropper.h

@@ -24,6 +24,7 @@ class FrameDropper
 {
 public:
     FrameDropper();
+    explicit FrameDropper(float max_time_drops);
     virtual ~FrameDropper() {}
 
     // Resets the FrameDropper to its initial state.
@@ -66,7 +67,6 @@ public:
     //                    instruction of when to drop frames.
     virtual float ActualFrameRate(WebRtc_UWord32 inputFrameRate) const;
 
-
 private:
     void FillBucket(float inKbits, float outKbits);
     void UpdateRatio();