- Add a SetPriority method to ThreadWrapper

- Remove 'priority' from CreateThread and related member variables from implementations
- Make supplying a name for threads, non-optional

BUG=
R=magjed@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/44729004

Cr-Commit-Position: refs/heads/master@{#8810}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8810 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/system_wrappers/source/thread_win.h

@@ -21,13 +21,14 @@ namespace webrtc {
 
 class ThreadWindows : public ThreadWrapper {
  public:
-  ThreadWindows(ThreadRunFunction func, void* obj, ThreadPriority prio,
-                const char* thread_name);
+  ThreadWindows(ThreadRunFunction func, void* obj, const char* thread_name);
   ~ThreadWindows() override;
 
   bool Start() override;
   bool Stop() override;
 
+  bool SetPriority(ThreadPriority priority) override;
+
  protected:
   void Run();
 
@@ -37,8 +38,6 @@ class ThreadWindows : public ThreadWrapper {
   ThreadRunFunction const run_function_;
   void* const obj_;
   bool stop_;
-  // TODO(tommi): Consider having a SetPriority method instead of this variable.
-  ThreadPriority prio_;
   HANDLE thread_;
   const std::string name_;
   rtc::ThreadChecker main_thread_;