Fix double-clicking in string interpolation

editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/editor/CompilationUnitEditor.java

Index: editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/editor/CompilationUnitEditor.java
diff --git a/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/editor/CompilationUnitEditor.java b/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/editor/CompilationUnitEditor.java
index 4d533627dbd500bef77a228c2a9b2b02de77228c..4188e293fe8357a3148d3a650f19644564097268 100644
--- a/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/editor/CompilationUnitEditor.java
+++ b/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/text/editor/CompilationUnitEditor.java
@@ -142,7 +142,7 @@ import java.util.Stack;
  * Dart code editor.
  */
 public class CompilationUnitEditor extends DartEditor implements IDartReconcilingListener_OLD {
-  class AdaptedSourceViewer extends DartSourceViewer {
+  public class AdaptedSourceViewer extends DartSourceViewer {
 
     public AdaptedSourceViewer(Composite parent, IVerticalRuler verticalRuler,
         IOverviewRuler overviewRuler, boolean showAnnotationsOverview, int styles,
@@ -202,6 +202,10 @@ public class CompilationUnitEditor extends DartEditor implements IDartReconcilin
       return fContentAssistant;
     }
 
+    public CompilationUnitEditor getEditor() {
+      return CompilationUnitEditor.this;
+    }
+
     @Override
     public boolean requestWidgetToken(IWidgetTokenKeeper requester) {
       if (PlatformUI.getWorkbench().getHelpSystem().isContextHelpDisplayed()) {