Add JS DCE gradle plugin

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/DefaultValues.kt

@@ -28,6 +28,8 @@ open class DefaultValues(val defaultValue: String, val possibleValues: List<Stri
 
     object StringNullDefault : DefaultValues("null")
 
+    object ListEmptyDefault : DefaultValues("<empty list>")
+
     object LanguageVersions : DefaultValues(
             "null",
             LanguageVersion.values().map { "\"${it.description}\"" }

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSDceArguments.java

@@ -14,27 +14,28 @@
  * limitations under the License.
  */
 
-package org.jetbrains.kotlin.cli.common.arguments
+package org.jetbrains.kotlin.cli.common.arguments;
 
-class K2JSDceArguments : CommonToolArguments() {
-    companion object {
-        const val serialVersionUID = 0L
-    }
+public class K2JSDceArguments extends CommonToolArguments {
+    private static final long serialVersionUID = 0;
 
-    @field:GradleOption(DefaultValues.StringNullDefault::class)
-    @field:Argument(value = "-output-dir", valueDescription = "<path>", description = "Output directory")
-    @JvmField
-    var outputDirectory: String? = null
+    @Argument(
+            value = "-output-dir",
+            valueDescription = "<path>",
+            description = "Output directory"
+    )
+    public String outputDirectory;
 
-    @field:Argument(
+    @Argument(
             value = "-keep",
             valueDescription = "<fully.qualified.name[,]>",
-            description = "List of fully-qualified names of declarations that shouldn't be eliminated")
-    @JvmField
-    var declarationsToKeep: Array<String>? = null
+            description = "List of fully-qualified names of declarations that shouldn't be eliminated"
+    )
+    public String[] declarationsToKeep;
 
-    @field:GradleOption(DefaultValues.BooleanFalseDefault::class)
-    @field:Argument(value = "-Xprint-reachability-info", description = "Print declarations marked as reachable")
-    @JvmField
-    var printReachabilityInfo: Boolean = false
+    @Argument(
+            value = "-Xprint-reachability-info",
+            description = "Print declarations marked as reachable"
+    )
+    public boolean printReachabilityInfo;
 }