Request keyframe if too many packets are missing and NACK is disabled.

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

Index: webrtc/modules/video_coding/main/source/jitter_buffer.h
diff --git a/webrtc/modules/video_coding/main/source/jitter_buffer.h b/webrtc/modules/video_coding/main/source/jitter_buffer.h
index 3961dff46ffaffb2d15fbb568fc311f6a46814cc..4bce1da3769ed38e698c5e2ddcc931473417f660 100644
--- a/webrtc/modules/video_coding/main/source/jitter_buffer.h
+++ b/webrtc/modules/video_coding/main/source/jitter_buffer.h
@@ -210,10 +210,19 @@ class VCMJitterBuffer {
   bool IsContinuousInState(const VCMFrameBuffer& frame,
                            const VCMDecodingState& decoding_state) const
       EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
+  // Returns true if |frame| is continuous in |decoding_state|, not taking
+  // decodable frames into account and ignoring the |decode_error_mode|.
+  bool IsContinuousInStateForDecoding(
+      const VCMFrameBuffer& frame, const VCMDecodingState& decoding_state) const
+      EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
   // Returns true if |frame| is continuous in the |last_decoded_state_|, taking
   // all decodable frames into account.
   bool IsContinuous(const VCMFrameBuffer& frame) const
       EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
+  // Returns true if |frame| is continuous in the |last_decoded_state_|, taking
+  // all decodable frames into account and ignoring the |decode_error_mode|.
+  bool IsContinuousForDecoding(const VCMFrameBuffer& frame) const
+      EXCLUSIVE_LOCKS_REQUIRED(crit_sect_);
   // Looks for frames in |incomplete_frames_| which are continuous in the
   // provided |decoded_state|. Starts the search from the timestamp of
   // |decoded_state|.
@@ -332,6 +341,8 @@ class VCMJitterBuffer {
   int num_duplicated_packets_ GUARDED_BY(crit_sect_);
   // Number of packets discarded by the jitter buffer.
   int num_discarded_packets_ GUARDED_BY(crit_sect_);
+  // Time when last decodable frame was received.
+  int64_t time_last_decodable_frame_ GUARDED_BY(crit_sect_);
   // Time when first packet is received.
   int64_t time_first_packet_ms_ GUARDED_BY(crit_sect_);