Feature/gclient fetcher
Created by: WAKazuyoshiAkiyama
Summary:
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add gn.bbclass/gn.py, which is the bitbake fetcher for gcleint. By using this bbclass, flutter-engine can store its source codes in DL_DIR. This is more suitable with Yocto style and will make the result of builds more reusable.
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Change SRC_URI of flutter-sdk from the git repo to the tarball.
- When major updating, flutter-sdk will overwrite its history. Due to this, the build may be unstable.
- By using the release tarball, this issue can be avoided.
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add .gitignore
- this is created to ignore *.pyc of gn.py