Change the thread interface in runtime/platform and use it starting all threads

runtime/bin/thread_pool.h

Index: runtime/bin/thread_pool.h
diff --git a/runtime/bin/thread_pool.h b/runtime/bin/thread_pool.h
index 10cbba44de042b72411d54c7517472e9b42bda09..ad4affac47ed83eb01859f487f2fd836558ee7ae 100644
--- a/runtime/bin/thread_pool.h
+++ b/runtime/bin/thread_pool.h
@@ -9,18 +9,6 @@
 #include "platform/globals.h"
 #include "platform/thread.h"
 
-// Declare the OS-specific types ahead of defining the generic classes.
-#if defined(TARGET_OS_LINUX)
-#include "bin/thread_pool_linux.h"
-#elif defined(TARGET_OS_MACOS)
-#include "bin/thread_pool_macos.h"
-#elif defined(TARGET_OS_WINDOWS)
-#include "bin/thread_pool_win.h"
-#else
-#error Unknown target os.
-#endif
-
-
 typedef void* Task;
 
 
@@ -77,7 +65,7 @@ class ThreadPool {
  private:
   Task WaitForTask();
 
-  static void* Main(void* args);
+  static void Main(uword args);
 
   TaskQueue queue_;
   // TODO(sgjesse): Move the monitor in TaskQueue to ThreadPool and
@@ -85,7 +73,7 @@ class ThreadPool {
   bool terminate_;
   int size_;  // Number of threads.
   TaskHandler task_handler_;
-  ThreadPoolData data_;
+  dart::ThreadHandle* threads_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadPool);
 };