IDL compiler: sync Python to r162600

Python side to:
Introduce toV8NoInline
https://codereview.chromium.org/78713009

BUG=239771
NOTRY=true
TBR=haraken

Review URL: https://codereview.chromium.org/98003003

git-svn-id: svn://svn.chromium.org/blink/trunk@162945 bbb929c8-8fbe-4397-9dbb-9b2b20218538