Revert of Remove SkThread.h, include SkMutex.h or SkAtomics.h as appropriate.

src/core/SkGlyphCache_Globals.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGlyphCache_Globals_DEFINED
 #define SkGlyphCache_Globals_DEFINED
 
 #include "SkGlyphCache.h"
-#include "SkMutex.h"
 #include "SkTLS.h"
 
 #ifndef SK_DEFAULT_FONT_CACHE_COUNT_LIMIT
     #define SK_DEFAULT_FONT_CACHE_COUNT_LIMIT   2048
 #endif
 
 #ifndef SK_DEFAULT_FONT_CACHE_LIMIT
     #define SK_DEFAULT_FONT_CACHE_LIMIT     (2 * 1024 * 1024)
 #endif
 
@@ skipping 91 matching lines @@
     static void* CreateTLS() {
         return SkNEW_ARGS(SkGlyphCache_Globals, (kNo_UseMutex));
     }
 
     static void DeleteTLS(void* ptr) {
         SkDELETE((SkGlyphCache_Globals*)ptr);
     }
 };
 
 #endif