Add Fast Scroller to Files app.

Bug: 30713593
Change-Id: I2733003e3b4adad9c01eac122aba1c976a2ec2f5
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 23c2577..c7a473e 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -58,4 +58,8 @@
     <dimen name="drop_icon_width">14dp</dimen>
 
     <dimen name="header_message_horizontal_padding">8dp</dimen>
+
+    <dimen name="fastscroll_default_thickness">8dp</dimen>
+    <dimen name="fastscroll_minimum_range">50dp</dimen>
+    <dimen name="fastscroll_margin">0dp</dimen>
 </resources>