Extract Dart specific node management into DartUnitIndexObjectManager.

pkg/analysis_server/lib/src/services/index/index_store.dart

Index: pkg/analysis_server/lib/src/services/index/index_store.dart
diff --git a/pkg/analysis_server/lib/src/services/index/index_store.dart b/pkg/analysis_server/lib/src/services/index/index_store.dart
index 858d0ac1b02fcac4108b32823e5a5c511ed34705..2b8dc2273b63d6368a4e86feb8da698017255002 100644
--- a/pkg/analysis_server/lib/src/services/index/index_store.dart
+++ b/pkg/analysis_server/lib/src/services/index/index_store.dart
@@ -20,48 +20,27 @@ abstract class InternalIndexStore extends IndexStore {
   String get statistics;
 
   /**
-   * Notifies the index store that we are going to index an unit with the given
-   * [unitElement].
-   *
-   * If the unit is a part of a library, then all its locations are removed.
-   *
-   * If it is a defining compilation unit of a library, then index store also
-   * checks if some previously indexed parts of the library are not parts of the
-   * library anymore, and clears their information.
-   *
-   * [context] - the [AnalysisContext] in which unit being indexed.
-   * [unitElement] - the element of the unit being indexed.
-   *
-   * Returns `true` if the given [unitElement] may be indexed, or `false` if
-   * belongs to a disposed [AnalysisContext], is not resolved completely, etc.
-   */
-  bool aboutToIndexDart(
-      AnalysisContext context, CompilationUnitElement unitElement);
-
-  /**
-   * Notifies the index store that we are going to index an unit with the given
-   * [htmlElement].
+   * Notifies the index store that we are going to index the given [object].
    *
    * [context] - the [AnalysisContext] in which unit being indexed.
-   * [htmlElement] - the [HtmlElement] being indexed.
+   * [object] - the object being indexed.
    *
-   * Returns `true` if the given [htmlElement] may be indexed, or `false` if
+   * Returns `true` if the given [object] may be indexed, or `false` if
    * belongs to a disposed [AnalysisContext], is not resolved completely, etc.
    */
-  bool aboutToIndexHtml(AnalysisContext context, HtmlElement htmlElement);
+  bool aboutToIndex(AnalysisContext context, Object object);
 
   /**
-   * Notifies the index store that there was an error during the current Dart
+   * Notifies the index store that there was an error during the current
    * indexing, and all the information recorded after the last
-   * [aboutToIndexDart] invocation must be discarded.
+   * [aboutToIndex] invocation must be discarded.
    */
-  void cancelIndexDart();
+  void cancelIndex();
 
   /**
-   * Notifies the index store that the current Dart or HTML unit indexing is
-   * done.
+   * Notifies the index store that the current object indexing is done.
    *
-   * If this method is not invoked after corresponding "aboutToIndex*"
+   * If this method is not invoked after corresponding [aboutToIndex]
    * invocation, all recorded information may be lost.
    */
   void doneIndex();