Move NumberOfProcessorsOnline from CPU to OS

src/libplatform/default-platform.cc

 // Copyright 2013 the V8 project 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 "default-platform.h"
 
 #include <algorithm>
 #include <queue>
 
 // TODO(jochen): We should have our own version of checks.h.
 #include "../checks.h"
-// TODO(jochen): Why is cpu.h not in platform/?
-#include "../cpu.h"
+#include "../platform.h"
 #include "worker-thread.h"
 
 namespace v8 {
 namespace internal {
 
 
 const int DefaultPlatform::kMaxThreadPoolSize = 4;
 
 
 DefaultPlatform::DefaultPlatform()
     : initialized_(false), thread_pool_size_(0) {}
 
 
 DefaultPlatform::~DefaultPlatform() {
   LockGuard<Mutex> guard(&lock_);
   queue_.Terminate();
   if (initialized_) {
     for (std::vector<WorkerThread*>::iterator i = thread_pool_.begin();
          i != thread_pool_.end(); ++i) {
       delete *i;
     }
   }
 }
 
 
 void DefaultPlatform::SetThreadPoolSize(int thread_pool_size) {
   LockGuard<Mutex> guard(&lock_);
   ASSERT(thread_pool_size >= 0);
   if (thread_pool_size < 1)
-    thread_pool_size = CPU::NumberOfProcessorsOnline();
+    thread_pool_size = OS::NumberOfProcessorsOnline();
   thread_pool_size_ =
       std::max(std::min(thread_pool_size, kMaxThreadPoolSize), 1);
 }
 
 
 void DefaultPlatform::EnsureInitialized() {
   LockGuard<Mutex> guard(&lock_);
   if (initialized_) return;
   initialized_ = true;
 
   for (int i = 0; i < thread_pool_size_; ++i)
     thread_pool_.push_back(new WorkerThread(&queue_));
 }
 
 void DefaultPlatform::CallOnBackgroundThread(Task *task,
                                              ExpectedRuntime expected_runtime) {
   EnsureInitialized();
   queue_.Append(task);
 }
 
 
 void DefaultPlatform::CallOnForegroundThread(v8::Isolate* isolate, Task* task) {
   // TODO(jochen): implement.
   task->Run();
   delete task;
 }
 
 } }  // namespace v8::internal