Add `newLintBaseline` task (#3925)

Add a task to regenerate the lint baseline.

app/build.gradle

@@ -60,8 +60,7 @@ android {
 
     lint {
         lintConfig file("lint.xml")
-        // Regenerate by deleting app/lint-baseline.xml, then run:
-        //   ./gradlew lintBlueDebug
+        // Regenerate by running `./gradlew app:newLintBaseline`
         baseline = file("lint-baseline.xml")
     }
 
@@ -203,3 +202,18 @@ tasks.withType(org.jetbrains.kotlin.gradle.internal.KaptWithoutKotlincTask) {
         "--add-opens", "jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED",
         "--add-opens", "jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED"])
 }
+
+tasks.register("newLintBaseline") {
+    description 'Deletes and then recreates the lint baseline'
+
+    // This task should always run, irrespective of caching
+    notCompatibleWithConfigurationCache("Is always out of date")
+    outputs.upToDateWhen { false }
+
+    doLast {
+        delete android.lint.baseline.path
+    }
+
+    // Regenerate the lint baseline
+    it.finalizedBy tasks.named("lintBlueDebug")
+}