CheckedTextView should be reported to accessibility as checkable.

bug:6219528

Change-Id: I7b57f69c29f20c8a9466c56226407b51b9bf3b3a

Author: sganov

core/java/android/widget/CheckedTextView.java

@@ -230,6 +230,7 @@ public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
         super.onInitializeAccessibilityNodeInfo(info);
         info.setClassName(CheckedTextView.class.getName());
+        info.setCheckable(true);
         info.setChecked(mChecked);
     }
 }