Start generating coverage. (#113587)

.ci.yaml

@@ -172,6 +172,14 @@ targets:
       validation: analyze
       validation_name: Analyze
 
+  - name: Linux coverage
+    bringup: true
+    recipe: flutter/coverage
+    timeout: 120
+    properties:
+      tags: >
+        ["framework", "hostonly", "shard", "linux"]
+
   - name: Linux packages_autoroller
     presubmit: false
     recipe: pub_autoroller/pub_autoroller

TESTOWNERS

@@ -287,6 +287,7 @@
 #
 # build_tests @zanderso @flutter/tool
 # ci_yaml flutter roller @caseyhillers @flutter/infra
+# coverage @godofredoc @flutter/infra
 # flutter_plugins @stuartmorgan @flutter/plugin
 # framework_tests @HansMuller @flutter/framework
 # tool_integration_tests @zanderso @flutter/tool