Added and replaced some UMAs

chrome/common/metrics/metrics_util_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/common/metrics/metrics_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
 
 TEST(MetricsUtilTest, HashName) {
   // Checks that hashing is stable on all platforms.
   struct {
     const char* name;
     uint32 hash_value;
   } known_hashes[] = {
     {"a", 937752454u},
     {"1", 723085877u},
     {"Trial Name", 2713117220u},
     {"Group Name", 3201815843u},
     {"My Favorite Experiment", 3722155194u},
     {"My Awesome Group Name", 4109503236u},
     {"abcdefghijklmonpqrstuvwxyz", 787728696u},
     {"0123456789ABCDEF", 348858318U}
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(known_hashes); ++i)
     EXPECT_EQ(known_hashes[i].hash_value, HashName(known_hashes[i].name));
 }
 
+TEST(MetricsUtilTest, ToLanguageCode) {
+  const int SPANISH = 25971;
+  const int JAPANESE = 27233;
+
+  // Basic case.
+  EXPECT_EQ(JAPANESE, ToLanguageCode("ja"));
+
+  // Case is ignored.
+  EXPECT_EQ(SPANISH, ToLanguageCode("Es"));
+
+  // Coutry code is ignored.
+  EXPECT_EQ(JAPANESE, ToLanguageCode("ja-JP"));
+
+  // Invalid locales are considered as unknown language.
+  EXPECT_EQ(0, ToLanguageCode(std::string()));
+  EXPECT_EQ(0, ToLanguageCode("1234"));
+
+  // "xx" is not acceptable because it doesn't exist in ISO 639-1 table.
+  // However, LanguageUsageMetrics doesn't tell what code is valid.
+  EXPECT_EQ(30840, ToLanguageCode("xx"));
+}
+
 }  // namespace metrics