Refactor Subzero initialization and add a browser callback handler.

src/IceGlobalContext.h

Index: src/IceGlobalContext.h
diff --git a/src/IceGlobalContext.h b/src/IceGlobalContext.h
index d81697d2ede5a0dddc67b68a19b665801cd9c869..4151a5ebff80b539e7af25de5f506586482ff1ca 100644
--- a/src/IceGlobalContext.h
+++ b/src/IceGlobalContext.h
@@ -300,6 +300,14 @@ public:
   EmitterWorkItem *emitQueueBlockingPop();
   void emitQueueNotifyEnd() { EmitQ.notifyEnd(); }
 
+  void initParserThread() {
+    ThreadContext *TLS = new ThreadContext();

[Jim Stichnoth, 2015/03/25 16:34:06]

I guess this gets renamed to Tls after
https://codereview.chromium.org/1030793002/ ?

[jvoung (off chromium), 2015/03/25 18:14:35]

Oops -- Done.

+    auto Timers = getTimers();
+    Timers->initInto(TLS->Timers);
+    AllThreadContexts.push_back(TLS);
+    ICE_TLS_SET_FIELD(TLS, TLS);
+  }
+
   void startWorkerThreads() {
     size_t NumWorkers = getFlags().getNumTranslationThreads();
     auto Timers = getTimers();