Bug 1558598 - Ensure mozinfo correctly detects WebRender. r=ahal

I don't know if this covers all the things that use mozinfo (probably not)
but it covers all the suites that use mozinfo and have webrender conditions
in the test manifests (i.e. mochitest and wpt variants).

Differential Revision: https://phabricator.services.mozilla.com/D35869

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

build/docs/mozinfo.rst

@@ -167,3 +167,10 @@ topsrcdir
    The path to the source directory the build came from.
 
    Always defined.
+
+webrender
+   Whether or not WebRender is enabled as the Gecko compositor.
+
+   Values are ``true`` and ``false``.
+
+   Always defined.

testing/mochitest/runtests.py

@@ -2594,6 +2594,7 @@ toolbar#nav-bar {
                 'dom.serviceWorkers.parent_intercept', False),
             "socketprocess_e10s": self.extraPrefs.get(
                 'network.process.enabled', False),
+            "webrender": options.enable_webrender,
         })
 
         self.setTestRoot(options)

testing/mozbase/mozinfo/mozinfo/mozinfo.py

@@ -66,7 +66,7 @@ info = {'os': unknown,
         'os_version': unknown,
         'bits': unknown,
         'has_sandbox': unknown,
-        'webrender': bool(os.environ.get("MOZ_WEBRENDER", False)),
+        'webrender': False,
         'automation': bool(os.environ.get("MOZ_AUTOMATION", False)),
         }
 (system, node, release, version, machine, processor) = platform.uname()

testing/web-platform/tests/tools/wptrunner/wptrunner/wptrunner.py

@@ -52,7 +52,8 @@ def get_loader(test_paths, product, debug=None, run_info_extras=None, **kwargs):
                                     browser_channel=kwargs.get("browser_channel"),
                                     verify=kwargs.get("verify"),
                                     debug=debug,
-                                    extras=run_info_extras)
+                                    extras=run_info_extras,
+                                    enable_webrender=kwargs.get("enable_webrender"))
 
     test_manifests = testloader.ManifestLoader(test_paths, force_manifest_update=kwargs["manifest_update"],
                                                manifest_download=kwargs["manifest_download"]).load()

testing/web-platform/tests/tools/wptrunner/wptrunner/wpttest.py

@@ -72,7 +72,8 @@ class RunInfo(dict):
                  browser_version=None,
                  browser_channel=None,
                  verify=None,
-                 extras=None):
+                 extras=None,
+                 enable_webrender=False):
         import mozinfo
         self._update_mozinfo(metadata_root)
         self.update(mozinfo.info)
@@ -102,6 +103,7 @@ class RunInfo(dict):
             self["wasm"] = False
         if extras is not None:
             self.update(extras)
+        self["webrender"] = enable_webrender
 
     def _update_mozinfo(self, metadata_root):
         """Add extra build information from a mozinfo.json file in a parent

testing/xpcshell/runxpcshelltests.py

@@ -1217,6 +1217,7 @@ class XPCShellTests(object):
         self.mozInfo['fission'] = prefs.get('fission.autostart', False)
         self.mozInfo['serviceworker_e10s'] = prefs.get(
             'dom.serviceWorkers.parent_intercept', False)
+        self.mozInfo['webrender'] = self.enable_webrender
 
         mozinfo.update(self.mozInfo)