Work on flexible mode and screen sharing.

webrtc/modules/video_coding/codecs/vp9/screenshare_layers.h

Index: webrtc/modules/video_coding/codecs/vp9/screenshare_layers.h
diff --git a/webrtc/modules/video_coding/codecs/vp9/screenshare_layers.h b/webrtc/modules/video_coding/codecs/vp9/screenshare_layers.h
new file mode 100644
index 0000000000000000000000000000000000000000..adcd81dfeecdeb88eb2a35b420824f9cb66d00d7
--- /dev/null
+++ b/webrtc/modules/video_coding/codecs/vp9/screenshare_layers.h
@@ -0,0 +1,34 @@
+/* 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_SCREENSHARE_LAYERS_H
+#define WEBRTC_SCREENSHARE_LAYERS_H
+
+#include <stdint.h>
+
+namespace webrtc {
+
+class ScreenshareLayersVP9 {
+ public:
+  ScreenshareLayersVP9();
+  bool ConfigureBitrate(int threshold_kbps);
+  void FrameEncoded(unsigned int size_bytes);
+  int8_t CurrentLayer();
+  std::array<int8_t, 4> BufferArguments(uint32_t timestamp);

[sprang_webrtc, 2015/09/07 14:39:04]

c++11 std-libs not yet allowed :(

[philipel, 2015/09/10 14:47:01]

Changed to a struct instead.

+
+ private:
+  float threshold_kbps_;
+  float sl0_bits_used_;
+  int8_t current_sl_;
+  uint32_t last_ts_;

[sprang_webrtc, 2015/09/07 14:39:04]

Please briefly comment what these do and/or don't abbreviate as much.
kbps is a commonly accepted one, but we generally try to be more descriptive.

[philipel, 2015/09/10 14:47:01]

Done.

+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_SCREENSHARE_LAYERS_H