Cache the numberOfProcessors value on posix and expose it to blink

base/sys_info_linux.cc

 // Copyright (c) 2011 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/sys_info.h"
 
 #include <limits>
 
 #include "base/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/sys_info_internal.h"
 
 namespace {
 
 int64 AmountOfMemory(int pages_name) {
   long pages = sysconf(pages_name);
   long page_size = sysconf(_SC_PAGESIZE);
   if (pages == -1 || page_size == -1) {
     NOTREACHED();
     return 0;
   }
@@ skipping 17 matching lines @@
     limit = 0;
   }
   if (limit < 0 ||
       static_cast<uint64>(limit) > std::numeric_limits<size_t>::max()) {
     limit = 0;
   }
   DCHECK(limit > 0);
   return static_cast<size_t>(limit);
 }
 
-template<typename T, T (*F)(void)>
-class LazySysInfoValue {
- public:
-  LazySysInfoValue()
-      : value_(F()) { }
-
-  ~LazySysInfoValue() { }
-
-  T value() { return value_; }
-
- private:
-  const T value_;
-
-  DISALLOW_COPY_AND_ASSIGN(LazySysInfoValue);
-};
-
-base::LazyInstance<LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
+base::LazyInstance<
+    base::internal::LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
     g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
-base::LazyInstance<LazySysInfoValue<size_t, MaxSharedMemorySize> >::Leaky
+base::LazyInstance<
+    base::internal::LazySysInfoValue<size_t, MaxSharedMemorySize> >::Leaky
     g_lazy_max_shared_memory = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 namespace base {
 
 // static
 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
   return AmountOfMemory(_SC_AVPHYS_PAGES);
 }
@@ skipping 25 matching lines @@
       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
         size_t pos = line.find(": ");
         return line.substr(pos + 2);
       }
     }
   }
   return std::string();
 }
 
 }  // namespace base