Show override indicator.

editor/tools/plugins/com.google.dart.tools.ui/plugin.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.4"?>
 <plugin>
 
    <extension-point id="dartElementFilters" name="%elementFiltersName" schema="schema/dartElementFilters.exsd"/>
    <extension-point id="dartEditorTextHovers" name="%javaEditorTextHoversName" schema="schema/dartEditorTextHovers.exsd"/>
    <extension-point id="dartDocCompletionProcessor" name="%javadocCompletionProcessor" schema="schema/dartDocCompletionProcessor.exsd"/>
    <extension-point id="quickFixProcessors" name="%quickFixProcessorExtensionPoint" schema="schema/quickFixProcessors.exsd"/>
    <extension-point id="quickAssistProcessors" name="%quickAssistProcessorExtensionPoint" schema="schema/quickAssistProcessors.exsd"/>
    <extension-point id="foldingStructureProviders" name="%foldingStructureProvidersExtensionPoint" schema="schema/foldingStructureProviders.exsd"/>
@@ skipping 456 matching lines @@
       </editor>
       <editor
             class="com.google.dart.tools.ui.internal.intro.IntroEditor"
             default="false"
             icon="icons/dart_16_16.gif"
             id="com.google.dart.tools.ui.intro.editor"
             name="Welcome">
       </editor>
    </extension>
    
+    <extension
+        point="org.eclipse.ui.editorActions">
+        <editorContribution
+            targetID="com.google.dart.tools.ui.text.editor.CompilationUnitEditor"
+            id="com.google.dart.tools.ui.text.editor.CompilationUnitEditor.ruler.actions">
+            <!--<action
+                label="%BookmarkRulerAction.label"
+                helpContextId="org.eclipse.ui.bookmark_action_context"
+                class="org.eclipse.ui.texteditor.BookmarkRulerAction"
+                actionID="RulerDoubleClick"
+                id="org.eclipse.jdt.internal.ui.javaeditor.BookmarkRulerAction">
+            </action>-->

[pquitslund, 2012/06/26 04:03:01]

Can we remove this (albeit commented out) JDT reference?

[scheglov, 2012/06/26 14:35:12]

From the rest of this file it looks for me that our approach is to have
everything, but commented and uncomment things once we are ready to implement
them.

+            <action
+                label="%JavaSelectRulerAction.label"

[pquitslund, 2012/06/26 04:03:01]

%DartSelectRulerAction.label?

[scheglov, 2012/06/26 14:35:12]

Done.

+                class="com.google.dart.tools.ui.internal.text.editor.DartSelectRulerAction"
+                actionID="RulerClick"
+                id="com.google.dart.tools.ui.internal.text.editor.DartSelectRulerAction">
+            </action>
+        </editorContribution>
+    </extension>
+
    <extension
          point="org.eclipse.ui.themes">
         <themeElementCategory label="%javaPresentation.label" id="org.eclipse.wst.jsdt.ui.presentation"/>
         <themeElementCategory label="%dartPresentation.label" id="com.google.dart.tools.ui.presentation"/>
       <!-- defaultsTo="org.eclipse.jface.textfont" -->
       <fontDefinition
             label="%javaEditorFontDefiniton.label"
             defaultsTo="com.google.dart.tools.ui.editors.textfont.default"
             categoryId="com.google.dart.tools.ui.presentation"
             id="com.google.dart.tools.ui.editors.textfont">
@@ skipping 2971 matching lines @@
    </extension>
     
    <extension
          point="com.google.dart.tools.ui.quickAssistProcessors">
       <quickAssistProcessor
             class="com.google.dart.tools.ui.internal.text.correction.QuickAssistProcessor"
             id="com.google.dart.tools.ui.internal.text.correction.QuickAssistProcessor"/>
    </extension>
 
 </plugin>