Plumb View.getAccessibilityNodeProvider though WebViewProvider.

This is needed to make use of the new Accessibility implementation
in the Chromium WebView. nos for WebView Classic.

Change-Id: I96bd2426d2de3b26dc9b72d0fdbacefa9bbe20f7

core/java/android/webkit/WebView.java

@@ -41,6 +41,7 @@ import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
+import android.view.accessibility.AccessibilityNodeProvider;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputConnection;
 import android.widget.AbsoluteLayout;
@@ -2051,6 +2052,13 @@ public class WebView extends AbsoluteLayout
     }
     */
 
+    @Override
+    public AccessibilityNodeProvider getAccessibilityNodeProvider() {
+        AccessibilityNodeProvider provider =
+                mProvider.getViewDelegate().getAccessibilityNodeProvider();
+        return provider == null ? super.getAccessibilityNodeProvider() : provider;
+    }
+
     @Deprecated
     @Override
     public boolean shouldDelayChildPressedState() {

core/java/android/webkit/WebViewClassic.java

@@ -90,6 +90,7 @@ import android.view.ViewRootImpl;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityManager;
 import android.view.accessibility.AccessibilityNodeInfo;
+import android.view.accessibility.AccessibilityNodeProvider;
 import android.view.inputmethod.BaseInputConnection;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputConnection;
@@ -1768,6 +1769,11 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
         return mWebViewPrivate.super_performAccessibilityAction(action, arguments);
     }
 
+    @Override
+    public AccessibilityNodeProvider getAccessibilityNodeProvider() {
+      return null;
+    }
+
     @Override
     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
         if (!mWebView.isEnabled()) {

core/java/android/webkit/WebViewProvider.java

@@ -32,6 +32,7 @@ import android.view.View;
 import android.view.ViewGroup.LayoutParams;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
+import android.view.accessibility.AccessibilityNodeProvider;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputConnection;
 import android.webkit.WebView.HitTestResult;
@@ -279,6 +280,8 @@ public interface WebViewProvider {
     interface ViewDelegate {
         public boolean shouldDelayChildPressedState();
 
+        public AccessibilityNodeProvider getAccessibilityNodeProvider();
+
         public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info);
 
         public void onInitializeAccessibilityEvent(AccessibilityEvent event);