#1268 - Adding horizontalAccuracy to location event

include/mbgl/ios/MGLMapboxEvents.h

@@ -11,6 +11,7 @@ extern NSString *const MGLEventKeyZoomLevel;
 extern NSString *const MGLEventKeySpeed;
 extern NSString *const MGLEventKeyCourse;
 extern NSString *const MGLEventKeyAltitude;
+extern NSString *const MGLEventKeyHorizontalAccuracy;
 extern NSString *const MGLEventKeyVerticalAccuracy;
 extern NSString *const MGLEventKeyPushEnabled;
 extern NSString *const MGLEventKeyEmailEnabled;

platform/ios/MGLMapboxEvents.m

@@ -24,6 +24,7 @@ NSString *const MGLEventKeyZoomLevel = @"zoom";
 NSString *const MGLEventKeySpeed = @"speed";
 NSString *const MGLEventKeyCourse = @"course";
 NSString *const MGLEventKeyAltitude = @"altitude";
+NSString *const MGLEventKeyHorizontalAccuracy = @"horizontalAccuracy";
 NSString *const MGLEventKeyVerticalAccuracy = @"verticalAccuracy";
 NSString *const MGLEventKeyPushEnabled = @"enabled.push";
 NSString *const MGLEventKeyEmailEnabled = @"enabled.email";

platform/ios/MGLMetricsLocationManager.m

@@ -47,6 +47,7 @@
             MGLEventKeySpeed: @(loc.speed),
             MGLEventKeyCourse: @(loc.course),
             MGLEventKeyAltitude: @(loc.altitude),
+            MGLEventKeyHorizontalAccuracy: @(loc.horizontalAccuracy),
             MGLEventKeyVerticalAccuracy: @(loc.verticalAccuracy)
         }];
     }