- 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/modules/utility/source/process_thread_impl.cc

@@ -70,7 +70,7 @@ void ProcessThreadImpl::Start() {
     m.module->ProcessThreadAttached(this);
 
   thread_ = ThreadWrapper::CreateThread(
-      &ProcessThreadImpl::Run, this, kNormalPriority, "ProcessThread");
+      &ProcessThreadImpl::Run, this, "ProcessThread");
   CHECK(thread_->Start());
 }