Move registration of Java mojo interfaces to the new InterfaceRegistrar.

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

Index: content/public/android/java/src/org/chromium/content/browser/NfcFactory.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/NfcFactory.java b/content/public/android/java/src/org/chromium/content/browser/NfcFactory.java
new file mode 100644
index 0000000000000000000000000000000000000000..7a475f18a71b6027a38f7f0227cb0987efb80f13
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/browser/NfcFactory.java
@@ -0,0 +1,61 @@
+// 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;
+
+import android.app.Activity;
+
+import org.chromium.content_public.browser.WebContents;
+import org.chromium.device.nfc.NfcImpl;
+import org.chromium.device.nfc.mojom.Nfc;
+import org.chromium.services.shell.InterfaceFactory;
+import org.chromium.ui.base.WindowAndroid;
+
+class NfcFactory implements InterfaceFactory<Nfc> {
+    private final WebContents mContents;
+
+    NfcFactory(WebContents contents) {
+        mContents = contents;
+    }
+
+    private static class ContextAwareNfcImpl
+            extends NfcImpl implements WindowAndroidChangedObserver {
+        private final ContentViewCore mContentViewCore;
+
+        ContextAwareNfcImpl(ContentViewCore contentViewCore) {
+            super(contentViewCore.getContext().getApplicationContext());
+            mContentViewCore = contentViewCore;
+            mContentViewCore.addWindowAndroidChangedObserver(this);
+            if (mContentViewCore.getWindowAndroid() != null) {
+                setActivity(mContentViewCore.getWindowAndroid().getActivity().get());
+            }
+        }
+
+        @Override
+        public void close() {
+            super.close();
+            if (mContentViewCore != null) {
+                mContentViewCore.removeWindowAndroidChangedObserver(this);
+            }
+        }
+
+        @Override
+        public void onWindowAndroidChanged(WindowAndroid newWindowAndroid) {
+            Activity activity = null;
+            if (newWindowAndroid != null) {
+                activity = newWindowAndroid.getActivity().get();
+            }
+            setActivity(activity);
+        }
+    }
+
+    @Override
+    public Nfc createImpl() {
+        ContentViewCore contentViewCore = ContentViewCore.fromWebContents(mContents);
+        if (contentViewCore == null) {
+            return null;
+        }
+        return new ContextAwareNfcImpl(contentViewCore);
+    }
+}