Extract bitrate allocation of spatial/temporal layers out of codec impl.

webrtc/common_video/BUILD.gn

 # Copyright (c) 2014 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.
 
 import("../build/webrtc.gni")
 
@@ skipping 13 matching lines @@
     "h264/pps_parser.h",
     "h264/sps_parser.cc",
     "h264/sps_parser.h",
     "h264/sps_vui_rewriter.cc",
     "h264/sps_vui_rewriter.h",
     "i420_buffer_pool.cc",
     "include/bitrate_adjuster.h",
     "include/frame_callback.h",
     "include/i420_buffer_pool.h",
     "include/incoming_video_stream.h",
+    "include/video_bitrate_allocator.h",
     "include/video_frame_buffer.h",
     "incoming_video_stream.cc",
     "libyuv/include/webrtc_libyuv.h",
     "libyuv/webrtc_libyuv.cc",
     "video_frame.cc",
     "video_frame_buffer.cc",
     "video_render_frames.cc",
     "video_render_frames.h",
   ]
 
@@ skipping 78 matching lines @@
     if (is_android) {
       deps += [ "//testing/android/native_test:native_test_support" ]
       shard_timeout = 900
     }
 
     if (is_ios) {
       deps += [ ":common_video_unittests_bundle_data" ]
     }
   }
 }