Add content description for folder up

 Bug: 6940202

Change-Id: I6b8c53285606fdcf6495a4ccf3c94a2037c8979b
diff --git a/src/com/android/browser/BreadCrumbView.java b/src/com/android/browser/BreadCrumbView.java
index aa77744..d331b53 100644
--- a/src/com/android/browser/BreadCrumbView.java
+++ b/src/com/android/browser/BreadCrumbView.java
@@ -179,6 +179,8 @@
                 LayoutParams.MATCH_PARENT));
         mBackButton.setOnClickListener(this);
         mBackButton.setVisibility(View.GONE);
+        mBackButton.setContentDescription(mContext.getText(
+                R.string.accessibility_button_bookmarks_folder_up));
         addView(mBackButton, 0);
     }