Re-land: "Use an explicit identifier in Config"

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

 /* Copyright (c) 2011 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.
 */
 /*
 * This file defines the interface for doing temporal layers with VP8.
 */
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_
 
 #include "vpx/vpx_encoder.h"
 
+#include "webrtc/common.h"
 #include "webrtc/common_video/include/video_image.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 struct CodecSpecificInfoVP8;
 
 class TemporalLayers {
  public:
   // Factory for TemporalLayer strategy. Default behaviour is a fixed pattern
   // of temporal layers. See default_temporal_layers.cc
   struct Factory {
     Factory() {}
     virtual ~Factory() {}
     virtual TemporalLayers* Create(int temporal_layers,
                                    uint8_t initial_tl0_pic_idx) const;
+    static const ConfigOptionID identifier =
+        ConfigOptionID::kTemporalLayersFactory;
   };
 
   virtual ~TemporalLayers() {}
 
   // Returns the recommended VP8 encode flags needed. May refresh the decoder
   // and/or update the reference buffers.
   virtual int EncodeFlags(uint32_t timestamp) = 0;
 
   virtual bool ConfigureBitrates(int bitrate_kbit,
                                  int max_bitrate_kbit,
@@ skipping 15 matching lines @@
 // layers based on input framerate so that the base layer has an acceptable
 // framerate. See realtime_temporal_layers.cc
 struct RealTimeTemporalLayersFactory : TemporalLayers::Factory {
   virtual ~RealTimeTemporalLayersFactory() {}
   virtual TemporalLayers* Create(int num_temporal_layers,
                                  uint8_t initial_tl0_pic_idx) const;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_