generation."
This CL removes the Python script and adds its C++ porting.
The former was in its early stage and it has permanently been removed.
This is a reland of https://codereview.webrtc.org/2740063004/ which
was reverted. Now the build errors are fixed.
BUG=webrtc:7218
Review-Url: https://codereview.webrtc.org/2752793002
Cr-Commit-Position: refs/heads/master@{#17300}