Fix machine_model behaviors in gpu blacklist.

gpu/config/gpu_control_list_machine_model_info_unittest.cc

 // Copyright (c) 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.
 
 #include "gpu/config/gpu_control_list.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gpu {
 
 class MachineModelInfoTest : public testing::Test {
@@ skipping 30 matching lines @@
         version2 = "5.4";
       MachineModelInfo info(name_op[i], "model",
                             version_op[j], version1, version2);
       EXPECT_TRUE(info.IsValid());
     }
   }
 }
 
 TEST_F(MachineModelInfoTest, ModelComparison) {
   MachineModelInfo info("=", "model_a", ">", "3.4", std::string());
+  EXPECT_TRUE(info.IsValid());
   EXPECT_TRUE(info.Contains("model_a", "4"));
   EXPECT_FALSE(info.Contains("model_b", "4"));
   EXPECT_FALSE(info.Contains("model_a", "3.2"));
 }
 
+TEST_F(MachineModelInfoTest, ModelNameNoVersion) {
+  MachineModelInfo info("=", "model_a", "any", std::string(), std::string());
+  EXPECT_TRUE(info.IsValid());
+  EXPECT_TRUE(info.Contains("model_a", std::string()));
+}
+
 }  // namespace gpu