modified Run button to always run the last launched application

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

 <?xml version="1.0" encoding="UTF-8"?>
 <?eclipse version="3.4"?>
 <plugin>
     <extension
          point="org.eclipse.core.expressions.propertyTesters">
       <propertyTester
             class="com.google.dart.tools.debug.ui.launch.RunPropertyTester"
             id="com.google.dart.tools.debug.ui.run.propertyTester"
             namespace="com.google.dart.tools.debug.ui.launch"
             properties="canLaunch"
@@ skipping 259 matching lines @@
       </view>
    </extension>
    <extension
          point="org.eclipse.ui.popupMenus">
       <viewerContribution
             id="com.google.dart.tools.debug.ui.viewerContribution"
             targetID="com.google.dart.tools.ui.LibraryExplorer">
          <action
                class="com.google.dart.tools.debug.ui.launch.DartRunAction"
                enablesFor="1"
-               id="com.google.dart.tools.debug.ui.run"
+               id="com.google.dart.tools.debug.ui.run.selection"
                label="Run in Browser"
                menubarPath="additions">
          </action>
          <visibility>
             <objectState
                   name="elementType"
                   value="com.google.dart.tools.core.model.DartElement.HTML_FILE">
             </objectState>
          </visibility>
       </viewerContribution>
    </extension>
 
    <extension
          point="org.eclipse.core.runtime.adapters">
       <factory
             adaptableType="com.google.dart.tools.core.model.DartElement"
             class="com.google.dart.tools.debug.ui.launch.ActionFilterAdapterFactory">
          <adapter
                type="org.eclipse.ui.IActionFilter">
          </adapter>
       </factory>
    </extension>
 
    <extension
       point="org.eclipse.ui.commands">
       <command
             categoryId="org.eclipse.ui.category.window"
+            defaultHandler="com.google.dart.tools.debug.ui.launch.DartRunLastHandler"
+            description="%runCommandName"
+            id="com.google.dart.tools.debug.ui.run.last"
+            name="%runCommandName">
+      </command>
+       <command
+            categoryId="org.eclipse.ui.category.window"
             defaultHandler="com.google.dart.tools.debug.ui.launch.DartRunHandler"
             description="%runCommandName"
-            id="com.google.dart.tools.debug.ui.run"
+            id="com.google.dart.tools.debug.ui.run.selection"
             name="%runCommandName">
       </command>
       <command
             categoryId="org.eclipse.ui.category.window"
             defaultHandler="com.google.dart.tools.debug.ui.launch.ManageLaunchesHandler"
             description="%launchDialogCommandName"
             id="com.google.dart.tools.debug.ui.launchDialog"
             name="%launchDialogCommandName">
       </command>
    </extension>
    <extension
          point="org.eclipse.ui.menus">
       <menuContribution
             allPopups="true"
             locationURI="popup:com.google.dart.tools.ui.FileExplorer?after=additions">
          <command
-               commandId="com.google.dart.tools.debug.ui.run"
+               commandId="com.google.dart.tools.debug.ui.run.selection"
                style="push">
             <visibleWhen
                   checkEnabled="false">
                <with
                      variable="selection">
                   <count
                         value="1">
                   </count>
                   <and>
                         <test
@@ skipping 58 matching lines @@
                disabledIcon="icons/full/dtool16/run_exc.gif"
                icon="icons/full/etool16/run_exc.gif"
                helpContextId="run_action_context"
                label="Run"
                style="pulldown">
          </action>
       </actionSet>
    </extension-->
 
 </plugin>