Add PhysicalWeb.hasPrerequisites()

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

Index: chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWeb.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWeb.java b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWeb.java
index 6a9f4c3bc4b9df7dfb9ce2b63dce12f80b479347..44fb86996238524872c4e2e7e081f23701d9d2ab 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWeb.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWeb.java
@@ -40,6 +40,17 @@ public class PhysicalWeb {
     }
 
     /**
+     * Checks Physical Web prerequisites.
+     * @return whether we have the necessary permissions to begin Physical Web scanning.
+     */
+    public static boolean hasPrerequisites() {
+        LocationUtils locationUtils = LocationUtils.getInstance();
+        return featureIsEnabled()
+                && locationUtils.hasAndroidLocationPermission()
+                && locationUtils.isSystemLocationSettingEnabled();
+    }
+
+    /**
      * Checks whether the Physical Web preference is switched to On.
      *
      * @return boolean {@code true} if the preference is On.
@@ -63,12 +74,7 @@ public class PhysicalWeb {
      * At the moment, this only enables URL discovery over BLE.
      */
     public static void startPhysicalWeb() {
-        // Only subscribe to Nearby if we have the location permission.
-        LocationUtils locationUtils = LocationUtils.getInstance();
-        if (locationUtils.hasAndroidLocationPermission()
-                && locationUtils.isSystemLocationSettingEnabled()) {
-            new NearbyBackgroundSubscription(NearbySubscription.SUBSCRIBE).run();
-        }
+        new NearbyBackgroundSubscription(NearbySubscription.SUBSCRIBE).run();
     }
 
     /**
@@ -117,7 +123,7 @@ public class PhysicalWeb {
      * Performs various Physical Web operations that should happen on startup.
      */
     public static void onChromeStart() {
-        if (!featureIsEnabled()) {
+        if (!hasPrerequisites()) {
             stopPhysicalWeb();
             return;
         }