fix suggestion dropdown offset

    http://b/issue?id=3394446
    adjust offset to new bckground resource
    and adjust based on quickcontrols mode
Change-Id: I93d096e6465f91fcbb01941aa3f746f5e3f77354
diff --git a/res/values/dimensions.xml b/res/values/dimensions.xml
index b1e1d92..300714b 100644
--- a/res/values/dimensions.xml
+++ b/res/values/dimensions.xml
@@ -44,4 +44,5 @@
     <dimen name="list_favicon_padding">5dip</dimen>
     <dimen name="list_favicon_corner_radius">3dip</dimen>
     <dimen name="tab_favicon_corner_radius">2dip</dimen>
+    <dimen name="dropdown_offset">8dip</dimen>
 </resources>