Issue 5359. Highlight 'on' in try-catch statement.

compiler/java/com/google/dart/compiler/ast/DartCatchBlock.java

Index: compiler/java/com/google/dart/compiler/ast/DartCatchBlock.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartCatchBlock.java b/compiler/java/com/google/dart/compiler/ast/DartCatchBlock.java
index 91818ad5ee2009d017ce9db4bb8f1a942da9295c..6ab02f5af492aedd9b6abf4546b84a5c17c8d8af 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartCatchBlock.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartCatchBlock.java
@@ -8,18 +8,25 @@ package com.google.dart.compiler.ast;
  * Represents a Dart 'catch' block.
  */
 public class DartCatchBlock extends DartStatement {
-  private DartParameter exception;
-  private DartParameter stackTrace;
-  private DartBlock block;
+  private final int onTokenOffset;
+  private final DartParameter exception;
+  private final DartParameter stackTrace;
+  private final DartBlock block;
 
   public DartCatchBlock(DartBlock block,
+                        int onTokenOffset,
                         DartParameter exception,
                         DartParameter stackTrace) {
     this.block = becomeParentOf(block);
+    this.onTokenOffset = onTokenOffset;
     this.exception = becomeParentOf(exception);
     this.stackTrace = becomeParentOf(stackTrace);
   }
 
+  public int getOnTokenOffset() {
+    return onTokenOffset;
+  }
+
   public DartParameter getException() {
     return exception;
   }