Bug 1734552 - Don't walk though the accessibility nodes on autofill. r=geckoview-reviewers,agi

When Autofill service runs with compatibility mode [*1] (such as Bitwarden),
`View.onProvideAutofillStructure` walks through the accessibility nodes.
Walking through it spends a lot of times.

When checking Android's source code, the following walks through it.

- `onProvideAutofillVirtualStructure`
- `autofill`
- `isVisibleToUserForAutofill`

Actually, since we already add autofill's virtual nodes, it is unnecessary to
walk through it.

*1 https://developer.android.com/reference/android/service/autofill/AutofillService#compatibility-mode

Differential Revision: https://phabricator.services.mozilla.com/D127952

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoView.java

@@ -785,8 +785,6 @@ public class GeckoView extends FrameLayout {
     @Override
     public void onProvideAutofillVirtualStructure(final ViewStructure structure,
                                                   final int flags) {
-        super.onProvideAutofillVirtualStructure(structure, flags);
-
         if (mSession == null) {
             return;
         }
@@ -798,8 +796,6 @@ public class GeckoView extends FrameLayout {
     @Override
     @TargetApi(26)
     public void autofill(@NonNull final SparseArray<AutofillValue> values) {
-        super.autofill(values);
-
         if (mSession == null) {
             return;
         }
@@ -814,6 +810,14 @@ public class GeckoView extends FrameLayout {
         mSession.autofill(strValues);
     }
 
+    @Override
+    public boolean isVisibleToUserForAutofill(final int virtualId) {
+        // If autofill service works with compatibility mode,
+        // View.isVisibleToUserForAutofill walks through the accessibility nodes.
+        // This override avoids it.
+        return true;
+    }
+
     /**
      * Request a {@link Bitmap} of the visible portion of the web page currently being
      * rendered.