Propagate some theme attributes from framework to appcompat

Make sure that apps can read the appcompat variants of theme attributes
reliably across versions in their layouts, styles, etc. without having
to duplicate their resources.

This change is not exhaustive; a number of other theme attributes
should get this same treatment.

Change-Id: If6a32d0220d2596658404cbce43b7d5d1f05054e
diff --git a/v7/appcompat/res/values-v11/themes_base.xml b/v7/appcompat/res/values-v11/themes_base.xml
index 30c78e4..ca7acbd 100644
--- a/v7/appcompat/res/values-v11/themes_base.xml
+++ b/v7/appcompat/res/values-v11/themes_base.xml
@@ -31,12 +31,22 @@
     <style name="Theme.Base" parent="android:Theme.Holo">
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowActionBar">false</item>
+
+        <!-- Attributes populated from the framework to be read by apps -->
+        <item name="buttonBarStyle">?android:attr/buttonBarStyle</item>
+        <item name="buttonBarButtonStyle">?android:attr/buttonBarButtonStyle</item>
+        <item name="selectableItemBackground">?android:attr/selectableItemBackground</item>
     </style>
 
     <!-- Base platform-dependent theme providing a light-themed activity. -->
     <style name="Theme.Base.Light" parent="android:Theme.Holo.Light">
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowActionBar">false</item>
+
+        <!-- Attributes populated from the framework to be read by apps -->
+        <item name="buttonBarStyle">?android:attr/buttonBarStyle</item>
+        <item name="buttonBarButtonStyle">?android:attr/buttonBarButtonStyle</item>
+        <item name="selectableItemBackground">?android:attr/selectableItemBackground</item>
     </style>
 
 </resources>