Pass selected cricket::VideoCodec down to internal H264 encoder

Pass the selected cricket::VideoCodec to H264EncoderImpl::H264EncoderImpl. The cricket::VideoCodec contains relevant information for H264 about selected profile and packetization mode.

BUG=chromium:600254,webrtc:6402, webrtc:6337

Review-Url: https://codereview.webrtc.org/2474993002
Cr-Commit-Position: refs/heads/master@{#15270}

webrtc/modules/video_coding/DEPS

@@ -4,6 +4,7 @@ include_rules = [
   "+vpx",
   "+webrtc/base",
   "+webrtc/common_video",
+  "+webrtc/media/base",
   "+webrtc/system_wrappers",
   "+webrtc/tools",
 ]