Collect metrics on running Accessibility services on Android

content/public/android/java/src/org/chromium/content/browser/accessibility/KitKatBrowserAccessibilityManager.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser.accessibility;
 
+import android.accessibilityservice.AccessibilityServiceInfo;
 import android.annotation.TargetApi;
 import android.os.Build;
 import android.os.Bundle;
 import android.view.accessibility.AccessibilityNodeInfo;
 
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.content.browser.ContentViewCore;
 
 /**
  * Subclass of BrowserAccessibilityManager for KitKat.
@@ skipping 18 matching lines @@
         bundle.putCharSequence("AccessibilityNodeInfo.roleDescription", roleDescription);
         if (isRoot) {
             bundle.putCharSequence("ACTION_ARGUMENT_HTML_ELEMENT_STRING_VALUES",
                     mSupportedHtmlElementTypes);
         }
         if (isEditableText) {
             node.setEditable(true);
             node.setTextSelection(selectionStartIndex, selectionEndIndex);
         }
     }
+
+    @Override
+    protected int getAccessibilityServiceCapabilitiesMask() {
+        int capabilitiesMask = 0;
+        for (AccessibilityServiceInfo service :
+                mAccessibilityManager.getEnabledAccessibilityServiceList(
+                        AccessibilityServiceInfo.FEEDBACK_ALL_MASK)) {
+            capabilitiesMask |= service.getCapabilities();
+        }
+        return capabilitiesMask;
+    }
 }