Handle incognito mode for accessibility tree

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 974f69353e715413a06e07cd2a46528d41c74b49..6903b9b1d87b00670828b9d377b69d6bcf613a64 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -2944,6 +2944,12 @@ public class ContentViewCore implements
     // @TargetApi(Build.VERSION_CODES.M) TODO(sgurun) add method document once API is public
     // crbug/512264
     public void onProvideVirtualStructure(final ViewStructure structure) {
+        // Do not collect accessibility tree in incognito mode
+        if (getWebContents().isIncognito()) {
+            structure.setChildCount(0);
+            return;
+        }
+
         structure.setChildCount(1);
         final ViewStructure viewRoot = structure.asyncNewChild(0);
         getWebContents().requestAccessibilitySnapshot(