GeoLocation: add support for GmsCore location provider

device/geolocation/android/java/src/org/chromium/device/geolocation/LocationProviderAndroid.java

 // Copyright 2017 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.device.geolocation;
 
 import android.content.Context;
 import android.location.Criteria;
 import android.location.Location;
 import android.location.LocationListener;
 import android.location.LocationManager;
 import android.os.Bundle;
 
 import org.chromium.base.Log;
 import org.chromium.base.ThreadUtils;
+import org.chromium.base.VisibleForTesting;
 
 import java.util.List;
 
 /**
  * This is a LocationProvider using Android APIs [1]. It is a separate class for clarity
  * so that it can manage all processing completely on the UI thread. The container class
  * ensures that the start/stop calls into this class are done on the UI thread.
  *
  * [1] https://developer.android.com/reference/android/location/package-summary.html
  */
 public class LocationProviderAndroid
         implements LocationListener, LocationProviderFactory.LocationProvider {
     private static final String TAG = "cr_LocationProvider";
 
     private Context mContext;
     private LocationManager mLocationManager;
     private boolean mIsRunning;
 
     LocationProviderAndroid(Context context) {
         mContext = context;
     }
 
     @Override
     public void start(boolean enableHighAccuracy) {
+        ThreadUtils.assertOnUiThread();
         unregisterFromLocationUpdates();
         registerForLocationUpdates(enableHighAccuracy);
     }
 
     @Override
     public void stop() {
+        ThreadUtils.assertOnUiThread();
         unregisterFromLocationUpdates();
     }
 
     @Override
     public boolean isRunning() {
+        ThreadUtils.assertOnUiThread();
         return mIsRunning;
     }
 
     @Override
     public void onLocationChanged(Location location) {
         // Callbacks from the system location service are queued to this thread, so it's
         // possible that we receive callbacks after unregistering. At this point, the
         // native object will no longer exist.
         if (mIsRunning) {
-            updateNewLocation(location);
+            LocationProviderAdapter.onNewLocationAvailable(location);
         }
     }
 
     @Override
     public void onStatusChanged(String provider, int status, Bundle extras) {}
 
     @Override
     public void onProviderEnabled(String provider) {}
 
     @Override
     public void onProviderDisabled(String provider) {}
 
-    private void ensureLocationManagerCreated() {
+    @VisibleForTesting
+    public void setLocationManagerForTesting(LocationManager manager) {
+        mLocationManager = manager;
+    }
+
+    private void createLocationManagerIfNeeded() {
         if (mLocationManager != null) return;
         mLocationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
         if (mLocationManager == null) {
             Log.e(TAG, "Could not get location manager.");
         }
     }
 
     /**
      * Registers this object with the location service.
      */
     private void registerForLocationUpdates(boolean enableHighAccuracy) {
-        ensureLocationManagerCreated();
+        createLocationManagerIfNeeded();
         if (usePassiveOneShotLocation()) return;
 
         assert !mIsRunning;
         mIsRunning = true;
 
         // We're running on the main thread. The C++ side is responsible to
         // bounce notifications to the Geolocation thread as they arrive in the mainLooper.
         try {
             Criteria criteria = new Criteria();
             if (enableHighAccuracy) criteria.setAccuracy(Criteria.ACCURACY_FINE);
             mLocationManager.requestLocationUpdates(
                     0, 0, criteria, this, ThreadUtils.getUiThreadLooper());
         } catch (SecurityException e) {
             Log.e(TAG,
                     "Caught security exception while registering for location updates "
                             + "from the system. The application does not have sufficient "
                             + "geolocation permissions.");
             unregisterFromLocationUpdates();
             // Propagate an error to JavaScript, this can happen in case of WebView
             // when the embedding app does not have sufficient permissions.
-            LocationProviderAdapter.newErrorAvailable("application does not have sufficient "
-                    + "geolocation permissions.");
+            LocationProviderAdapter.newErrorAvailable(
+                    "application does not have sufficient geolocation permissions.");
         } catch (IllegalArgumentException e) {
             Log.e(TAG, "Caught IllegalArgumentException registering for location updates.");
             unregisterFromLocationUpdates();
             assert false;
         }
     }
 
     /**
      * Unregisters this object from the location service.
      */
     private void unregisterFromLocationUpdates() {
-        if (mIsRunning) {
-            mIsRunning = false;
-            mLocationManager.removeUpdates(this);
-        }
-    }
-
-    private void updateNewLocation(Location location) {
-        LocationProviderAdapter.newLocationAvailable(location.getLatitude(),
-                location.getLongitude(), location.getTime() / 1000.0, location.hasAltitude(),
-                location.getAltitude(), location.hasAccuracy(), location.getAccuracy(),
-                location.hasBearing(), location.getBearing(), location.hasSpeed(),
-                location.getSpeed());
+        if (!mIsRunning) return;
+        mIsRunning = false;
+        mLocationManager.removeUpdates(this);
     }
 
     private boolean usePassiveOneShotLocation() {
-        if (!isOnlyPassiveLocationProviderEnabled()) return false;
+        if (!isOnlyPassiveLocationProviderEnabled()) {
+            return false;
+        }
 
         // Do not request a location update if the only available location provider is
         // the passive one. Make use of the last known location and call
-        // onLocationChanged directly.
+        // onNewLocationAvailable directly.
         final Location location =
                 mLocationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
         if (location != null) {
             ThreadUtils.runOnUiThread(new Runnable() {
                 @Override
                 public void run() {
-                    updateNewLocation(location);
+                    LocationProviderAdapter.onNewLocationAvailable(location);
                 }
             });
         }
         return true;
     }
 
     /*
      * Checks if the passive location provider is the only provider available
      * in the system.
      */
     private boolean isOnlyPassiveLocationProviderEnabled() {
-        List<String> providers = mLocationManager.getProviders(true);
+        final List<String> providers = mLocationManager.getProviders(true);
         return providers != null && providers.size() == 1
                 && providers.get(0).equals(LocationManager.PASSIVE_PROVIDER);
     }
 }