Upstream NFC beam URL sharing code and add it to ChromeShell.

chrome/android/java/src/org/chromium/chrome/browser/nfc/BeamController.java

+// Copyright 2012 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.app.Activity;
+import android.nfc.NfcAdapter;
+import android.util.Log;
+
+/**
+ * Initializes Android Beam (sharing URL via NFC) for devices that have NFC. If user taps their
+ * device with another Beam capable device, then Chrome gets the current URL, filters for security
+ * and returns the result to Android.
+ */
+public final class BeamController {
+    /**
+     * If the device has NFC, construct a BeamCallback and pass it to Android.
+     *
+     * @param activity Activity that is sending out beam messages.
+     * @param provider Provider that returns the URL that should be shared.
+     */
+    public static void registerForBeam(final Activity activity, final BeamProvider provider) {
+        final NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(activity);
+        if (nfcAdapter == null) return;
+        try {
+            final BeamCallback beamCallback = new BeamCallback(activity, provider);
+            nfcAdapter.setNdefPushMessageCallback(beamCallback, activity);
+            nfcAdapter.setOnNdefPushCompleteCallback(beamCallback, activity);
+        } catch (IllegalStateException e) {
+            Log.w("BeamController", "NFC registration failure. Can't retry, giving up.");
+        }
+    }
+}