Added a Formatter parameter to DateUtils.formatDateRange

DateUtils.formatDateRange is using String.format which isn't efficient for
formatting large number of strings. I have added the Formatter parameter which
allows the caller to reuse the formatter of subsequent calls for faster
performance.

api/current.xml

@@ -126565,6 +126565,27 @@
 <parameter name="flags" type="int">
 </parameter>
 </method>
+<method name="formatDateRange"
+ return="java.util.Formatter"
+ abstract="false"
+ native="false"
+ synchronized="false"
+ static="true"
+ final="false"
+ deprecated="not deprecated"
+ visibility="public"
+>
+<parameter name="context" type="android.content.Context">
+</parameter>
+<parameter name="formatter" type="java.util.Formatter">
+</parameter>
+<parameter name="startMillis" type="long">
+</parameter>
+<parameter name="endMillis" type="long">
+</parameter>
+<parameter name="flags" type="int">
+</parameter>
+</method>
 <method name="formatDateTime"
  return="java.lang.String"
  abstract="false"