Add unittest to avoid duplicate id in gpu driver bug list

gpu/config/gpu_control_list.h

 // 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.
 
 #ifndef GPU_CONFIG_GPU_CONTROL_LIST_H_
 #define GPU_CONFIG_GPU_CONTROL_LIST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 73 matching lines @@
   std::string version() const;
 
   // Check if we need more gpu info to make the decisions.
   // This is computed from the last MakeDecision() call.
   // If yes, we should create a gl context and do a full gpu info collection.
   bool needs_more_info() const { return needs_more_info_; }
 
   // Returns the number of entries.  This is only for tests.
   size_t num_entries() const;
 
+  // This is only for tests.
+  bool has_duplicate_entry_id() const;

[Zhenyao Mo, 2016/10/17 17:30:04]

nit: duplicate -> duplicated

[qiankun, 2016/10/18 01:52:56]

Done.

+
   // Register a feature to FeatureMap - used to construct a GpuControlList.
   void AddSupportedFeature(const std::string& feature_name, int feature_id);
   // Register whether "all" is recognized as all features.
   void set_supports_feature_type_all(bool supported);
 
   // Enables logging of control list decisions.
   void enable_control_list_logging(
       const std::string& control_list_logging_name) {
     control_list_logging_enabled_ = true;
     control_list_logging_name_ = control_list_logging_name;
@@ skipping 389 matching lines @@
   bool supports_feature_type_all_;
 
   bool control_list_logging_enabled_;
   std::string control_list_logging_name_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_CONFIG_GPU_CONTROL_LIST_H_