Consider clickable nodes as leaves

This aligns us more closely with how TalkBack treats clickables. Note that at the moment, only ARC++ sets the |clickable| property.

Bug: b:111083342
Change-Id: Ida5383ee34ae30b8d01a556c48044096a909eac4
Reviewed-on: https://chromium-review.googlesource.com/1243670
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594417}

chrome/browser/resources/chromeos/chromevox/cvox2/background/automation_predicate.js

@@ -197,7 +197,8 @@ AutomationPredicate.leaf = function(node) {
       node.state[State.INVISIBLE] || node.children.every(function(n) {
         return n.state[State.INVISIBLE];
       }) ||
-      !!AutomationPredicate.math(node);
+      // Explicitly only check the clickable attribute here (for Android).
+      node.clickable || !!AutomationPredicate.math(node);
 };
 
 /**