Specify the output paths of the scenario app lint task (flutter#27684)

Author: jason-simmons

testing/scenario_app/android/BUILD.gn

@@ -30,7 +30,7 @@ gradle_task("android_lint") {
   task = "lint"
   gradlew_dir = rebase_path(".")
   sources = _android_sources
-  outputs = [ "$root_out_dir/scenario_app/build/reports" ]
+  outputs = [ "$root_out_dir/scenario_app/reports/lint-results.xml" ]
   deps = [ "//flutter/testing/scenario_app:scenario_app_snapshot" ]
 }
 

testing/scenario_app/android/app/build.gradle

@@ -15,6 +15,9 @@ android {
         showAll true
         warningsAsErrors true
         checkTestSources true
+        htmlReport false
+        xmlReport true
+        xmlOutput file("${rootProject.buildDir}/reports/lint-results.xml")
         // UnpackedNativeCode can break stack unwinding - see b/193408481
         // NewerVersionAvailable and GradleDependency need to be taken care of
         // by a roller rather than as part of CI.