Bug 1639349 - [ci] Set up a SCHEDULES rule to exclude non-webrender tests on webrender-only pushes, r=gbrown

Depends on D76433

Differential Revision: https://phabricator.services.mozilla.com/D76434

gfx/moz.build

@@ -47,3 +47,9 @@ SPHINX_TREES['/gfx'] = 'docs'
 
 with Files('docs/**'):
     SCHEDULES.exclusive = ['docs']
+
+with Files('wr/**'):
+    SCHEDULES.exclusive = ['webrender']
+
+with Files('webrender_bindings/**'):
+    SCHEDULES.exclusive = ['webrender']

python/mozbuild/mozbuild/schedules.py

@@ -35,14 +35,15 @@ INCLUSIVE_COMPONENTS = sorted(INCLUSIVE_COMPONENTS)
 # Exclusive components are those which are scheduled by default, but for which
 # some files *only* affect that component.  For example, most files affect all
 # platforms, but platform-specific files exclusively affect a single platform.
-# These components are assigned to `SCHEDULES.exclusive` with `=`.
+# These components are assigned to `SCHEDULES.exclusive` with `=`. Each comment
+# denotes a new mutually exclusive set of groups that tasks can belong to.
 EXCLUSIVE_COMPONENTS = [
     # os families
     'android',
     'linux',
     'macosx',
     'windows',
-    # test suite categories
+    # broad test harness categories
     'awsy',
     'condprofile',
     'cppunittest',
@@ -58,15 +59,17 @@ EXCLUSIVE_COMPONENTS = [
     'xpcshell',
     'xpcshell-coverage',
     'web-platform-tests',
-    'web-platform-tests-crashtest',
-    'web-platform-tests-reftest',
-    'web-platform-tests-wdspec',
-    # specific test suites via schedules-component
+    # specific test suites
+    'crashtest',
     'mochitest-a11y',
     'mochitest-browser-chrome',
     'mochitest-chrome',
     'mochitest-plain',
-    'crashtest',
+    'web-platform-tests-crashtest',
+    'web-platform-tests-reftest',
+    'web-platform-tests-wdspec',
+    # webrender enabled
+    'webrender',
 ]
 EXCLUSIVE_COMPONENTS = sorted(EXCLUSIVE_COMPONENTS)
 ALL_COMPONENTS = INCLUSIVE_COMPONENTS + EXCLUSIVE_COMPONENTS

taskcluster/taskgraph/transforms/tests.py

@@ -1592,6 +1592,9 @@ def set_schedules_components(config, tasks):
         schedules.add(category)
         schedules.add(platform_family(task['build-platform']))
 
+        if task['webrender']:
+            schedules.add('webrender')
+
         task['schedules-component'] = sorted(schedules)
         yield task