Add a webrtc{en,de}coderfactory implementation for VideoToolbox

webrtc/DEPS

 # Define rules for which include paths are allowed in our source.
 include_rules = [
   # Base is only used to build Android APK tests and may not be referenced by
   # WebRTC production code.
   "-base",
   "-chromium",
   "+external/webrtc/webrtc",  # Android platform build.
   "+gflags",
   "+libyuv",
   "-webrtc",  # Has to be disabled; otherwise all dirs below will be allowed.
   # Individual headers that will be moved out of here, see webrtc:4243.
   "+webrtc/call.h",
   "+webrtc/common.h",
   "+webrtc/common_types.h",
   "+webrtc/common_video/rotation.h",
   "+webrtc/config.h",
   "+webrtc/transport.h",
   "+webrtc/typedefs.h",
   "+webrtc/video_decoder.h",
   "+webrtc/video_encoder.h",
   "+webrtc/video_frame.h",
   "+webrtc/video_receive_stream.h",
   "+webrtc/video_renderer.h",
   "+webrtc/video_send_stream.h",
   "+webrtc/voice_engine_configurations.h",
 
   "+WebRTC",
   "+webrtc/api",
   "+webrtc/base",
+  "+webrtc/common_video",

[magjed_webrtc, 2016/11/01 14:00:20]

Should this be common_video/include instead? Also, can you remove the special
cases for common_video elsewhere in this file?

[kthelgason, 2016/11/01 15:14:30]

Actually, it could be common_video/h264 but I think leaving it like this and
removing the other special cases is better.

   "+webrtc/modules/include",
+  "+webrtc/modules/video_coding",

[magjed_webrtc, 2016/11/01 14:00:20]

I'm uncertain about adding webrtc/modules/video_coding in the top DEPS file. Can
you try to add it to a DEPS filer closer to the usage, i.e. webrtc/sdk/DEPS?
Maybe we should even create a new webrtc/sdk/objc/Framework/Classes/DEPS file if
that makes sense.

[kthelgason, 2016/11/01 15:14:30]

Acknowledged.

   "+webrtc/test",
   "+webrtc/tools",
 ]
 
 # The below rules will be removed when webrtc:4243 is fixed.
 specific_include_rules = {
   "video_frame\.h": [
     "+webrtc/common_video",
   ],
   "video_receive_stream\.h": [
     "+webrtc/common_video/include",
     "+webrtc/media/base",
   ],
   "video_send_stream\.h": [
     "+webrtc/common_video/include",
     "+webrtc/media/base",
   ],
 }