Remember visibility range for DartVariable

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/model/info/DartVariableInfo.java

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/model/info/DartVariableInfo.java
diff --git a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/model/info/DartVariableInfo.java b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/model/info/DartVariableInfo.java
index 68ff9255836427b8fc0dced96bb0a48c9ec974c5..7a6040cb260f63475f130398f8a8efb9bbcfc9cf 100644
--- a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/model/info/DartVariableInfo.java
+++ b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/model/info/DartVariableInfo.java
@@ -13,6 +13,9 @@
  */
 package com.google.dart.tools.core.internal.model.info;
 
+import com.google.dart.tools.core.internal.model.SourceRangeImpl;
+import com.google.dart.tools.core.model.SourceRange;
+
 /**
  * Instances of the class <code>DartVariableInfo</code> maintain the cached data shared by all equal
  * variables.
@@ -29,6 +32,9 @@ public class DartVariableInfo extends DeclarationElementInfo {
    */
   private boolean isParameter;
 
+  private int visibleStart;
+  private int visibleEnd;
+
   /**
    * Return the name of the declared type of this variable, or <code>null</code> if this variable
    * does not have a declared type.
@@ -40,6 +46,13 @@ public class DartVariableInfo extends DeclarationElementInfo {
   }
 
   /**
+   * @return the {@link SourceRange} in which this variable is visible.
+   */
+  public SourceRange getVisibleRange() {
+    return new SourceRangeImpl(visibleStart, visibleEnd - visibleStart + 1);
+  }
+
+  /**
    * Return <code>true</code> if this variable is a parameter.
    * 
    * @return <code>true</code> if this variable is a parameter
@@ -65,4 +78,18 @@ public class DartVariableInfo extends DeclarationElementInfo {
   public void setTypeName(char[] name) {
     typeName = name;
   }
+
+  /**
+   * Sets the end of source range in which this variable is visible.
+   */
+  public void setVisibleEnd(int visibleEnd) {
+    this.visibleEnd = visibleEnd;
+  }
+
+  /**
+   * Sets the start of source range in which this variable is visible.
+   */
+  public void setVisibleStart(int visibleStart) {
+    this.visibleStart = visibleStart;
+  }
 }