Add a basic account picker to the bookmarks picker

The account picker only shows up when you
have multiple accounts providing bookmarks.

Change-Id: I341d37d81551ca571713ac66d564c9cb0a86653c
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 1d21fc8..cbd9bbc 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -741,9 +741,13 @@
     <string name="error_console_eval_button_text" translatable="false">Evaluate</string>
 
     <!-- The default state to the "up to parent folder" button in the bookmarks UI. This
-         is displayed when the user is at the highest level and cannot go up -->
+         is displayed when the user is at the highest level and cannot go up [CHAR LIMIT=16] -->
     <string name="defaultBookmarksUpButton">Bookmarks</string>
 
+    <!-- The string that is displayed when there are no bookmarks to display.
+         This is centered in the middle of the screen [CHAR LIMIT=NONE] -->
+    <string name="empty_bookmarks_folder">There are no bookmarks</string>
+
     <!-- Access point for RLZ tracking. -->
     <string name="rlz_access_point">Y1</string>