update kotlin javascript stdlib if needed

compiler/util/src/org/jetbrains/jet/utils/KotlinPaths.java

@@ -40,5 +40,8 @@ public interface KotlinPaths {
     File getAndroidSdkAnnotationsPath();
 
     @NotNull
-    File getJsLibJarPath();
+    File getJsStdLibJarPath();
+
+    @NotNull
+    File getJsStdLibSrcJarPath();
 }

compiler/util/src/org/jetbrains/jet/utils/KotlinPathsFromHomeDir.java

@@ -66,10 +66,16 @@ public class KotlinPathsFromHomeDir implements KotlinPaths {
 
     @Override
     @NotNull
-    public File getJsLibJarPath() {
+    public File getJsStdLibJarPath() {
         return getLibraryFile(PathUtil.JS_LIB_JAR_NAME);
     }
 
+    @Override
+    @NotNull
+    public File getJsStdLibSrcJarPath() {
+        return getLibraryFile(PathUtil.JS_LIB_SRC_JAR_NAME);
+    }
+
     @NotNull
     private File getLibraryFile(@NotNull String fileName) {
         return new File(getLibPath(), fileName);

compiler/util/src/org/jetbrains/jet/utils/LibraryUtils.java

@@ -17,6 +17,7 @@
 package org.jetbrains.jet.utils;
 
 import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.vfs.VirtualFile;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -24,6 +25,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.List;
 import java.util.Properties;
 import java.util.jar.Attributes;
 import java.util.jar.JarFile;
@@ -147,4 +149,14 @@ public class LibraryUtils {
     public static boolean isJvmRuntimeLibrary(@NotNull File library) {
         return checkImplTitle(library, TITLE_KOTLIN_JVM_RUNTIME_AND_STDLIB);
     }
+
+    public static VirtualFile getJarFile(@NotNull List<VirtualFile> classesRoots, @NotNull String jarName) {
+        for (VirtualFile root : classesRoots) {
+            if (root.getName().equals(jarName)) {
+                return root;
+            }
+        }
+
+        return null;
+    }
 }