Create a field trial to test if we can detect good QPC implementations.

base/cpu.h

 // 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.
 
 #ifndef BASE_CPU_H_
 #define BASE_CPU_H_
 
 #include <string>
 
 #include "base/base_export.h"
@@ skipping 27 matching lines @@
   int extended_model() const { return ext_model_; }
   int extended_family() const { return ext_family_; }
   bool has_mmx() const { return has_mmx_; }
   bool has_sse() const { return has_sse_; }
   bool has_sse2() const { return has_sse2_; }
   bool has_sse3() const { return has_sse3_; }
   bool has_ssse3() const { return has_ssse3_; }
   bool has_sse41() const { return has_sse41_; }
   bool has_sse42() const { return has_sse42_; }
   bool has_avx() const { return has_avx_; }
+  bool has_non_stop_time_stamp_counter() const {
+    return has_non_stop_time_stamp_counter_;
+  }
   IntelMicroArchitecture GetIntelMicroArchitecture() const;
   const std::string& cpu_brand() const { return cpu_brand_; }
 
  private:
   // Query the processor for CPUID information.
   void Initialize();
 
   int type_;  // process type
   int family_;  // family of the processor
   int model_;  // model of processor
   int stepping_;  // processor revision number
   int ext_model_;
   int ext_family_;
   bool has_mmx_;
   bool has_sse_;
   bool has_sse2_;
   bool has_sse3_;
   bool has_ssse3_;
   bool has_sse41_;
   bool has_sse42_;
   bool has_avx_;
+  bool has_non_stop_time_stamp_counter_;
   std::string cpu_vendor_;
   std::string cpu_brand_;
 };
 
 }  // namespace base
 
 #endif  // BASE_CPU_H_