Bug 1034167 - Part 2: Explicit set scrollbars in TabsTray (r=mfinkle)

mobile/android/base/resources/values-land/styles.xml

@@ -7,6 +7,7 @@
 
     <style name="TabsList" parent="TabsListBase">
          <item name="android:orientation">horizontal</item>
+         <item name="android:scrollbars">horizontal</item>
     </style>
 
     <style name="TabsItem">

mobile/android/base/resources/values-large-land-v11/styles.xml

@@ -7,6 +7,7 @@
 
     <style name="TabsList" parent="TabsListBase">
          <item name="android:orientation">vertical</item>
+         <item name="android:scrollbars">vertical</item>
     </style>
 
     <style name="Widget.BookmarkFolderView" parent="Widget.TwoLinePageRow.Title">

mobile/android/base/resources/values-large-v11/styles.xml

@@ -30,6 +30,7 @@
 
     <style name="TabsList" parent="TabsListBase">
          <item name="android:orientation">horizontal</item>
+         <item name="android:scrollbars">horizontal</item>
     </style>
 
     <style name="TabsItem">

mobile/android/base/resources/values/styles.xml

@@ -435,6 +435,7 @@
 
     <style name="TabsList" parent="TabsListBase">
          <item name="android:orientation">vertical</item>
+         <item name="android:scrollbars">vertical</item>
     </style>
 
     <style name="TabsItem">