Add "aidl.flags:" property for cc_/java_ modules

The property can be used to pass additional flags to the AIDL compiler.
For example,

  cc_library {
    ..
    srcs: ["Foo.aidl"],
    aidl: {
      flags: [
        "-Werror",      // warnings as error
        "-Weverything", // turn on all warnings
      ],
    },
  }

Bug: 168028537
Test: soong test
Change-Id: I8120eeae7cd7b1acdd34c554af996a29e760a368

java/java.go

@@ -304,6 +304,9 @@ type CompilerDeviceProperties struct {
 
 		// whether to generate Binder#GetTransaction name method.
 		Generate_get_transaction_name *bool
+
+		// list of flags that will be passed to the AIDL compiler
+		Flags []string
 	}
 
 	// If true, export a copy of the module as a -hostdex module for host testing.
@@ -872,6 +875,8 @@ func (j *Module) aidlFlags(ctx android.ModuleContext, aidlPreprocess android.Opt
 	var flags []string
 	var deps android.Paths
 
+	flags = append(flags, j.deviceProperties.Aidl.Flags...)
+
 	if aidlPreprocess.Valid() {
 		flags = append(flags, "-p"+aidlPreprocess.String())
 		deps = append(deps, aidlPreprocess.Path())

java/java_test.go

@@ -2424,6 +2424,22 @@ func TestAidlExportIncludeDirsFromImports(t *testing.T) {
 	}
 }
 
+func TestAidlFlagsArePassedToTheAidlCompiler(t *testing.T) {
+	ctx, _ := testJava(t, `
+		java_library {
+			name: "foo",
+			srcs: ["aidl/foo/IFoo.aidl"],
+			aidl: { flags: ["-Werror"], },
+		}
+	`)
+
+	aidlCommand := ctx.ModuleForTests("foo", "android_common").Rule("aidl").RuleParams.Command
+	expectedAidlFlag := "-Werror"
+	if !strings.Contains(aidlCommand, expectedAidlFlag) {
+		t.Errorf("aidl command %q does not contain %q", aidlCommand, expectedAidlFlag)
+	}
+}
+
 func TestDataNativeBinaries(t *testing.T) {
 	ctx, config := testJava(t, `
 		java_test_host {