Move platform abstraction to base library

src/libplatform/default-platform.cc

Index: src/libplatform/default-platform.cc
diff --git a/src/libplatform/default-platform.cc b/src/libplatform/default-platform.cc
index 994a5173e339a787d82853def83c5af6c3731d5e..3cba2f6ca09d5b895cf470b870f7e4fadd05e3c1 100644
--- a/src/libplatform/default-platform.cc
+++ b/src/libplatform/default-platform.cc
@@ -7,10 +7,9 @@
 #include <algorithm>
 #include <queue>
 
-// TODO(jochen): We should have our own version of checks.h.
-#include "src/checks.h"
+#include "src/base/logging.h"
+#include "src/base/platform/platform.h"
 #include "src/libplatform/worker-thread.h"
-#include "src/platform.h"
 
 namespace v8 {
 namespace internal {
@@ -24,7 +23,7 @@ DefaultPlatform::DefaultPlatform()
 
 
 DefaultPlatform::~DefaultPlatform() {
-  LockGuard<Mutex> guard(&lock_);
+  base::LockGuard<base::Mutex> guard(&lock_);
   queue_.Terminate();
   if (initialized_) {
     for (std::vector<WorkerThread*>::iterator i = thread_pool_.begin();
@@ -36,17 +35,17 @@ DefaultPlatform::~DefaultPlatform() {
 
 
 void DefaultPlatform::SetThreadPoolSize(int thread_pool_size) {
-  LockGuard<Mutex> guard(&lock_);
+  base::LockGuard<base::Mutex> guard(&lock_);
   ASSERT(thread_pool_size >= 0);
   if (thread_pool_size < 1)
-    thread_pool_size = OS::NumberOfProcessorsOnline();
+    thread_pool_size = base::OS::NumberOfProcessorsOnline();
   thread_pool_size_ =
       std::max(std::min(thread_pool_size, kMaxThreadPoolSize), 1);
 }
 
 
 void DefaultPlatform::EnsureInitialized() {
-  LockGuard<Mutex> guard(&lock_);
+  base::LockGuard<base::Mutex> guard(&lock_);
   if (initialized_) return;
   initialized_ = true;