Request key frames to battle error propagation.

The VP8 decoder wrapper will request key frames 30 frames after seeing
a packet loss, if it hasn't received a state refresh (only possible
through key frames in this version).

For this to be possible the jitter buffer has been made aware of
picture ids to be able to detect frame losses. Legacy JB code to
handle streams without marker bits was also removed since it
conflicts with streams with FEC.

BUG=
TEST=

Review URL: http://webrtc-codereview.appspot.com/239002

git-svn-id: http://webrtc.googlecode.com/svn/trunk@774 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/video_coding/main/source/jitter_buffer.h

@@ -150,10 +150,6 @@ private:
     // Find oldest complete frame, used for getting next frame to decode
     VCMFrameListItem* FindOldestCompleteContinuousFrame();
 
-    // Check if a frame is missing the markerbit but is complete
-    bool CheckForCompleteFrame(VCMFrameListItem* oldestFrameItem);
-
-
     void CleanUpOldFrames();
     void CleanUpSizeZeroFrames();
 
@@ -181,6 +177,7 @@ private:
                                     const void* timestamp);
     static bool CompleteDecodableKeyFrameCriteria(VCMFrameBuffer* frame,
                                                   const void* notUsed);
+    bool ContinuousPictureId(int pictureId) const;
     // Decide whether should wait for NACK (mainly relevant for hybrid mode)
     bool WaitForNack();
 
@@ -205,6 +202,7 @@ private:
     WebRtc_Word32           _lastDecodedSeqNum;
     // Timestamp of last frame that was given to decoder
     WebRtc_Word64           _lastDecodedTimeStamp;
+    int                     _lastDecodedPictureId;
     WebRtc_UWord32          _packetsNotDecodable;
 
     // Statistics
@@ -241,7 +239,6 @@ private:
     WebRtc_UWord16          _NACKSeqNum[kNackHistoryLength];
     WebRtc_UWord32          _NACKSeqNumLength;
 
-    bool                    _missingMarkerBits;
     bool                    _firstPacket;
 };