added image button role on android

Summary:
Because we're now separating accessibilityTraits into accessibilityRole and accessibilityState, we're going to only allow one role to be set, and allow on preset combinations of roles that make sense.

This adds android functionality for an added role that is image button.

Reviewed By: blavalla

Differential Revision: D8846987

fbshipit-source-id: 9fe36828f63b05bd2c9cf9680204b1995d678342

Author: Ziqi Chen

Diff for: ReactAndroid/src/main/java/com/facebook/react/uimanager/AccessibilityRoleUtil.java

@@ -34,6 +34,7 @@ public enum AccessibilityRole {
     LINK("android.widget.Button"),
     SEARCH("android.widget.EditText"),
     IMAGE("android.widget.ImageView"),
+    IMAGEBUTTON("android.widget.ImageView"),
     KEYBOARDKEY("android.inputmethodservice.Keyboard$Key"),
     TEXT("android.widget.ViewGroup"),
     ADJUSTABLE("android.widget.SeekBar");
@@ -91,6 +92,10 @@ public static void setRole(AccessibilityNodeInfoCompat nodeInfo, final Accessibi
     if (role.equals(AccessibilityRole.IMAGE)) {
       nodeInfo.setRoleDescription("Image");
     }
+    if (role.equals(AccessibilityRole.IMAGEBUTTON)) {
+      nodeInfo.setRoleDescription("Button Image");
+      nodeInfo.setClickable(true);
+    }
     if (role.equals(AccessibilityRole.ADJUSTABLE)) {
       nodeInfo.setRoleDescription("Adjustable");
     }