Bug 1583353 - [mozbuild] Forward unrecognized kwargs to underlying class in MozbuildObject.from_environment(), r=firefox-build-system-reviewers,mshal

This allows subclasses of MozbuildObject to define additional instance
arguments and still use 'from_environment'.

Differential Revision: https://phabricator.services.mozilla.com/D51174

--HG--
extra : moz-landing-system : lando

python/mozbuild/mozbuild/base.py

@@ -109,7 +109,7 @@ class MozbuildObject(ProcessExecutionMixin):
         self._virtualenv_manager = None
 
     @classmethod
-    def from_environment(cls, cwd=None, detect_virtualenv_mozinfo=True):
+    def from_environment(cls, cwd=None, detect_virtualenv_mozinfo=True, **kwargs):
         """Create a MozbuildObject by detecting the proper one from the env.
 
         This examines environment state like the current working directory and
@@ -186,7 +186,7 @@ class MozbuildObject(ProcessExecutionMixin):
         # If we can't resolve topobjdir, oh well. We'll figure out when we need
         # one.
         return cls(topsrcdir, None, None, topobjdir=topobjdir,
-                   mozconfig=mozconfig)
+                   mozconfig=mozconfig, **kwargs)
 
     def resolve_mozconfig_topobjdir(self, default=None):
         topobjdir = self.mozconfig['topobjdir'] or default