ChromeOS: Implement periodic timezone refresh on geolocation data.

chromeos/timezone/timezone_unittest.cc

Index: chromeos/timezone/timezone_unittest.cc
diff --git a/chromeos/timezone/timezone_unittest.cc b/chromeos/timezone/timezone_unittest.cc
index 3987313d0bcb69a8b230f1f7f1f4bf3f7c15ca69..ee8dc9a84e4bc8f9e893b118b5641eec73d4f336 100644
--- a/chromeos/timezone/timezone_unittest.cc
+++ b/chromeos/timezone/timezone_unittest.cc
@@ -6,6 +6,7 @@
 #include "base/run_loop.h"
 #include "chromeos/geolocation/geoposition.h"
 #include "chromeos/timezone/timezone_provider.h"
+#include "chromeos/timezone/timezone_resolver.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/test_url_fetcher_factory.h"
@@ -287,4 +288,13 @@ TEST_F(TimeZoneTest, InvalidResponse) {
   }
 }
 
+TEST(TimeZoneResolverTest, CheckIntervals) {
+  for (int requests_count = 1; requests_count < 10; ++requests_count) {
+    EXPECT_EQ(requests_count,
+              TimeZoneResolver::MaxRequestsCountForIntervalForTesting(
+                  TimeZoneResolver::IntervalForNextRequestForTesting(
+                      requests_count)));
+  }
+}
+
 }  // namespace chromeos