Make more use of generated code in Java analysis server.

editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/SourceRegion.java

-/*
- * Copyright (c) 2014, the Dart project authors.
- * 
- * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
- * in compliance with the License. You may obtain a copy of the License at
- * 
- * http://www.eclipse.org/legal/epl-v10.html
- * 
- * Unless required by applicable law or agreed to in writing, software distributed under the License
- * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
- * or implied. See the License for the specific language governing permissions and limitations under
- * the License.
- */
-package com.google.dart.server;
-
-/**
- * The interface {@code SourceRegion} defines the behavior of objects representing a range of
- * characters within a {@link Source}.
- * 
- * @coverage dart.server
- */
-public interface SourceRegion {
-  /**
-   * Check if <code>x</code> is in [offset, offset + length] interval.
-   */
-  public boolean containsInclusive(int x);
-
-  /**
-   * Return the length of the region.
-   * 
-   * @return the length of the region
-   */
-  public int getLength();
-
-  /**
-   * Return the offset to the beginning of the region.
-   * 
-   * @return the offset to the beginning of the region
-   */
-  public int getOffset();
-}