Send the value of google_brand::GetBrand in component update checks.

components/update_client/utils_unittest.cc

 // Copyright 2016 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 "base/files/file_path.h"
 #include "base/path_service.h"
 #include "components/update_client/utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
@@ skipping 39 matching lines @@
   EXPECT_FALSE(VerifyFileHash256(
       MakeTestFilePath("jebgalgnebhfojomionfpkfelancnnkf.crx"),
       std::string("abcd")));
 
   EXPECT_FALSE(VerifyFileHash256(
       MakeTestFilePath("jebgalgnebhfojomionfpkfelancnnkf.crx"),
       std::string(
           "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")));
 }
 
+// Tests that the brand matches ^([a-zA-Z]{4})?$
+TEST(UpdateClientUtils, IsValidBrand) {
+  EXPECT_TRUE(IsValidBrand(std::string("")));
+  EXPECT_TRUE(IsValidBrand(std::string("T")));
+  EXPECT_TRUE(IsValidBrand(std::string("TE")));
+  EXPECT_TRUE(IsValidBrand(std::string("TES")));
+  EXPECT_TRUE(IsValidBrand(std::string("TEST")));
+  EXPECT_TRUE(IsValidBrand(std::string("")));
+  EXPECT_TRUE(IsValidBrand(std::string("t")));
+  EXPECT_TRUE(IsValidBrand(std::string("te")));
+  EXPECT_TRUE(IsValidBrand(std::string("tes")));
+  EXPECT_TRUE(IsValidBrand(std::string("test")));
+  EXPECT_TRUE(IsValidBrand(std::string("TEst")));
+
+  EXPECT_FALSE(IsValidBrand(std::string("TESTS")));  // Too long.
+  EXPECT_FALSE(IsValidBrand(std::string("TES1")));   // Has digit.
+  EXPECT_FALSE(IsValidBrand(std::string(" TES")));   // Begins with white space.
+  EXPECT_FALSE(IsValidBrand(std::string("TES ")));   // Ends with white space.
+  EXPECT_FALSE(IsValidBrand(std::string("T ES")));   // Contains white space.
+  EXPECT_FALSE(IsValidBrand(std::string("<TE")));    // Has <.
+  EXPECT_FALSE(IsValidBrand(std::string("TE>")));    // Has >.
+  EXPECT_FALSE(IsValidBrand(std::string("\xaa")));   // Has non-ASCII char.
+}
+
 }  // namespace update_client