[iOS] Upstream iOS geolocation code

ios/chrome/browser/geolocation/CLLocation+XGeoHeaderTest.mm

+// Copyright 2013 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.
+
+#import <CoreLocation/CoreLocation.h>
+
+#import "ios/chrome/browser/geolocation/CLLocation+XGeoHeader.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+NSString* const kEncoded550BatterySt =
+    @"a cm9sZTogQ1VSUkVOVF9MT0NBVElPTgpwcm9kdWNlcjogREVWSUNFX0xPQ0FUSU9OCnRpbWV"
+     "zdGFtcDogMTM4OTAwMDAwMDAwMDAwMApyYWRpdXM6IDEwMDAwCmxhdGxuZyA8CiAgbGF0aXR1"
+     "ZGVfZTc6IDM3Nzk2MzIyMAogIGxvbmdpdHVkZV9lNzogLTEyMjQwMDI5MTAKPg==";
+
+TEST(CLLocationXGeoHeaderTest, TestXGeoString) {
+  CLLocationCoordinate2D coordinate =
+      CLLocationCoordinate2DMake(37.796322, -122.400291);
+  // Picked a fixed timestamp. This one is 2014-01-06 09:20:00 +0000.
+  NSDate* timestamp = [NSDate dateWithTimeIntervalSince1970:1389000000];
+  CLLocation* location =
+      [[[CLLocation alloc] initWithCoordinate:coordinate
+                                     altitude:0
+                           horizontalAccuracy:10
+                             verticalAccuracy:100
+                                       course:0
+                                        speed:0
+                                    timestamp:timestamp] autorelease];
+  NSString* xGeoString = [location cr_xGeoString];
+  EXPECT_TRUE([xGeoString isEqualToString:kEncoded550BatterySt]);
+}
+
+}  // namespace