Using dimension instead of relyong on relativeLayout for view positions

Search box can be hidden as a result of various state flags. But the dependent
views should still retain their positions

Change-Id: I820ac11d120f9c78a457e64f3f21d9e8ff3f6110
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index f8f9c2a..b7e7ca1 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -95,7 +95,12 @@
 
     <dimen name="all_apps_divider_margin_vertical">8dp</dimen>
 
-<!-- Widget tray -->
+    <!-- Derived dimens -->
+    <dimen name="all_apps_search_bar_field_height_and_margin">56dp</dimen>
+    <!-- all_apps_search_bar_field_height_and_margin + all_apps_header_tab_height -->
+    <dimen name="all_apps_tabs_top_margin">106dp</dimen>
+
+ <!-- Widget tray -->
     <dimen name="widget_preview_label_vertical_padding">8dp</dimen>
     <dimen name="widget_preview_label_horizontal_padding">16dp</dimen>