Make sure temporal layered screenshare frames are sent in at least 2s.

webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h

 /* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
@@ skipping 12 matching lines @@
 struct CodecSpecificInfoVP8;
 class Clock;
 
 class ScreenshareLayers : public TemporalLayers {
  public:
   static const double kMaxTL0FpsReduction;
   static const double kAcceptableTargetOvershoot;
   static const int kTl0Flags;
   static const int kTl1Flags;
   static const int kTl1SyncFlags;
+  static const int kMaxFrameIntervalMs;
 
   ScreenshareLayers(int num_temporal_layers,
                     uint8_t initial_tl0_pic_idx,
                     Clock* clock);
   virtual ~ScreenshareLayers();
 
   // Returns the recommended VP8 encode flags needed. May refresh the decoder
   // and/or update the reference buffers.
   int EncodeFlags(uint32_t timestamp) override;
 
@@ skipping 19 matching lines @@
   bool TimeToSync(int64_t timestamp) const;
 
   Clock* const clock_;
 
   int number_of_temporal_layers_;
   bool last_base_layer_sync_;
   uint8_t tl0_pic_idx_;
   int active_layer_;
   int64_t last_timestamp_;
   int64_t last_sync_timestamp_;
+  int64_t last_emitted_tl0_timestamp_;
   rtc::TimestampWrapAroundHandler time_wrap_handler_;
   int min_qp_;
   int max_qp_;
   uint32_t max_debt_bytes_;
   int frame_rate_;
 
   static const int kMaxNumTemporalLayers = 2;
   struct TemporalLayer {
     TemporalLayer()
         : state(State::kNormal),
@@ skipping 27 matching lines @@
     int64_t num_overshoots_ = 0;
     int64_t tl0_qp_sum_ = 0;
     int64_t tl1_qp_sum_ = 0;
     int64_t tl0_target_bitrate_sum_ = 0;
     int64_t tl1_target_bitrate_sum_ = 0;
   } stats_;
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_