Use Nearby to background scan for URLs

chrome/android/java/src/org/chromium/chrome/browser/physicalweb/NearbyBackgroundSubscription.java

Index: chrome/android/java/src/org/chromium/chrome/browser/physicalweb/NearbyBackgroundSubscription.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/NearbyBackgroundSubscription.java b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/NearbyBackgroundSubscription.java
new file mode 100644
index 0000000000000000000000000000000000000000..a14520589cee16573c2b0be2902ea8ef58a2d9e9
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+++ b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/NearbyBackgroundSubscription.java
@@ -0,0 +1,72 @@
+// 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.physicalweb;
+
+import android.app.PendingIntent;
+import android.content.Intent;
+
+import com.google.android.gms.common.api.PendingResult;
+import com.google.android.gms.common.api.Status;
+import com.google.android.gms.nearby.Nearby;
+
+import org.chromium.base.ContextUtils;
+
+
+/**
+ * This class represents a connection to Google Play Services that does background
+ * subscription/unsubscription to Nearby Eddystone-URLs.
+ */
+class NearbyBackgroundSubscription extends NearbySubscription {
+    private static final String TAG = "PhysicalWeb";
+    private final int mAction;
+    private final Runnable mCallback;
+
+    NearbyBackgroundSubscription(int action, Runnable callback) {
+        super(ContextUtils.getApplicationContext());
+        mAction = action;
+        mCallback = callback;
+    }
+
+    NearbyBackgroundSubscription(int action) {
+        this(action, null);
+    }
+
+    private PendingIntent createNearbySubscribeIntent() {
+        Intent intent =
+                new Intent(ContextUtils.getApplicationContext(), NearbyMessageIntentService.class);
+        PendingIntent pendingIntent = PendingIntent.getService(
+                ContextUtils.getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
+        return pendingIntent;
+    }
+
+    @Override
+    protected void onConnected() {
+        PendingResult<Status> pendingResult = null;
+        String actionStr = null;
+        if (mAction == SUBSCRIBE) {
+            pendingResult = Nearby.Messages.subscribe(
+                    getGoogleApiClient(), createNearbySubscribeIntent(), createSubscribeOptions());
+            actionStr = "background subscribe";
+        } else {
+            pendingResult = Nearby.Messages.unsubscribe(
+                    getGoogleApiClient(), createNearbySubscribeIntent());
+            actionStr = "background unsubscribe";
+        }
+        pendingResult.setResultCallback(new SimpleResultCallback(actionStr) {
+            @Override
+            public void onResult(final Status status) {
+                super.onResult(status);
+                disconnect();
+                if (mCallback != null) {
+                    mCallback.run();
+                }
+            }
+        });
+    }
+
+    void run() {
+        connect();
+    }
+}