Add update.properties file to com.google.dart.tools.core_*.jar file

dart/editor/tools/features/com.google.dart.tools.deploy.feature_releng/build_rcp.xml

Index: dart/editor/tools/features/com.google.dart.tools.deploy.feature_releng/build_rcp.xml
diff --git a/dart/editor/tools/features/com.google.dart.tools.deploy.feature_releng/build_rcp.xml b/dart/editor/tools/features/com.google.dart.tools.deploy.feature_releng/build_rcp.xml
index 90999f7c45fdaa471896a4295519a99aa7f4d984..366d93734d8dcc4abb46a9c714fe00e539449922 100644
--- a/dart/editor/tools/features/com.google.dart.tools.deploy.feature_releng/build_rcp.xml
+++ b/dart/editor/tools/features/com.google.dart.tools.deploy.feature_releng/build_rcp.xml
@@ -155,6 +155,7 @@ build system.  The PDE build system has to run under Eclipse.
         <property name="build.dart.sdk" value="true"/>
 
         <echoProperty propertyname="build.revision" />
+        <echoProperty propertyname="build.channel" />
         <echoProperty propertyname="build.builder" />
         <echoProperty propertyname="build.root" />
         <echoProperty propertyname="build.out" />
@@ -376,6 +377,12 @@ build system.  The PDE build system has to run under Eclipse.
             <replacefilter token="@REVISION@" value="${build.revision}" />
         </replace>
 
+        <echo message="replacing @CHANNEL@ in ${build.stage.plugins}/com.google.dart.tools.core/update.properties" />
+        <replace dir="${build.stage.plugins}/com.google.dart.tools.core" >
+            <include name="update.properties" />
+            <replacefilter token="@CHANNEL@" value="${build.channel}" />
+        </replace>
+
         <echo message="replacing @BUILDYEAR@ in ${build.stage.plugins}/com.google.dart.tools.ui/src/com/google/dart/tools/ui/dialogs/DialogsMessages.properties" />
         <replace dir="${build.stage.plugins}/com.google.dart.tools.ui" summary="true">
             <include name="**/ui/dialogs/*.properties" />