Reland #2 of Issue 2434073003: Extract bitrate allocation ...

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

Index: webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h
diff --git a/webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h b/webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h
index 8392bc4f35568fc91f68e5dfc04db03fea0d3f12..e4d3c76aabaa095daac343ee0037a2c9928b7013 100644
--- a/webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h
+++ b/webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h
@@ -9,9 +9,7 @@
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
 
-#include <list>
-
-#include "vpx/vpx_encoder.h"
+#include <vector>
 
 #include "webrtc/base/timeutils.h"
 #include "webrtc/modules/video_coding/codecs/vp8/temporal_layers.h"
@@ -41,10 +39,15 @@ class ScreenshareLayers : public TemporalLayers {
   // and/or update the reference buffers.
   int EncodeFlags(uint32_t timestamp) override;
 
-  bool ConfigureBitrates(int bitrate_kbps,
-                         int max_bitrate_kbps,
-                         int framerate,
-                         vpx_codec_enc_cfg_t* cfg) override;
+  // Update state based on new bitrate target and incoming framerate.
+  // Returns the bitrate allocation for the active temporal layers.
+  std::vector<uint32_t> OnRatesUpdated(int bitrate_kbps,
+                                       int max_bitrate_kbps,
+                                       int framerate) override;
+
+  // Update the encoder configuration with target bitrates or other parameters.
+  // Returns true iff the configuration was actually modified.
+  bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override;
 
   void PopulateCodecSpecific(bool base_layer_sync,
                              CodecSpecificInfoVP8* vp8_info,
@@ -54,11 +57,6 @@ class ScreenshareLayers : public TemporalLayers {
 
   int CurrentLayerId() const override;
 
-  // Allows the layers adapter to update the encoder configuration prior to a
-  // frame being encoded. Return true if the configuration should be updated
-  // and false if now change is needed.
-  bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override;
-
  private:
   bool TimeToSync(int64_t timestamp) const;
 
@@ -75,7 +73,8 @@ class ScreenshareLayers : public TemporalLayers {
   int min_qp_;
   int max_qp_;
   uint32_t max_debt_bytes_;
-  int frame_rate_;
+  int framerate_;
+  bool bitrate_updated_;
 
   static const int kMaxNumTemporalLayers = 2;
   struct TemporalLayer {