[webnfc] WIP: Implement push method for Android nfc mojo service.

chrome/android/java/src/org/chromium/chrome/browser/nfc/NfcIntentHandler.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.chrome.browser.nfc;
+
+import android.content.Context;
+import android.content.Intent;
+import android.nfc.NfcAdapter;
+import android.support.v4.content.LocalBroadcastManager;
+
+/**
+ * When NFC mojo service enables foreground dispatch for NFC adapter, chrome
+ * can receive intent that contains NfcAdapter.EXTRA_TAG. Forward such Intents
+ * to NFC mojo service.
+ */
+public final class NfcIntentHandler {
+    public static boolean handleIntent(final Context context, final Intent intent) {
+        if (!intent.hasExtra(NfcAdapter.EXTRA_TAG)) return false;
+        LocalBroadcastManager manager = LocalBroadcastManager.getInstance(context);
+        return manager.sendBroadcast(intent);
+    }
+}