DocumentsUI tablet support.

Shows as a faux dialog on larger tablets, since the normal dialog
themes from framework don't support action bars.  Instead, this hacks
itself to look like a dialog with an InsetDrawable.  Detects touches
in dim area to dismiss dialog.

Show all action bar icons on tablets, and roots panel is always
visible with a different shadow. Show settings in dialog. Allow mode
switches in recents.

Bug: 10329832
Change-Id: Id02982ce7b0d4694962d32f8d5286fdfcc207208
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index e5b5b4e..25b0f84 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -19,4 +19,7 @@
     <dimen name="root_icon_size">24dp</dimen>
     <dimen name="grid_width">180dp</dimen>
     <dimen name="grid_height">180dp</dimen>
+
+    <bool name="show_as_dialog">false</bool>
+    <bool name="always_show_summary">false</bool>
 </resources>