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

src/ports/SkFontConfigInterface_direct.cpp

 /*
  * Copyright 2009 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* migrated from chrome/src/skia/ext/SkFontHost_fontconfig_direct.cpp */
 
 #include <unistd.h>
 #include <fcntl.h>
 
 #include <fontconfig/fontconfig.h>
 
 #include "SkBuffer.h"
 #include "SkFontConfigInterface.h"
 #include "SkLazyPtr.h"
-#include "SkMutex.h"
 #include "SkStream.h"
 #include "SkString.h"
 
 size_t SkFontConfigInterface::FontIdentity::writeToMemory(void* addr) const {
     size_t size = sizeof(fID) + sizeof(fTTCIndex);
     size += sizeof(int32_t) + sizeof(int32_t) + sizeof(uint8_t); // weight, width, italic
     size += sizeof(int32_t) + fString.size();    // store length+data
     if (addr) {
         SkWBuffer buffer(addr, size);
 
@@ skipping 699 matching lines @@
                 *trimmedMatches.append() = match[i];
             }
         }
 
         SkFontStyleSet_FC* sset = SkNEW_ARGS(SkFontStyleSet_FC,
                                              (trimmedMatches.begin(),
                                               trimmedMatches.count()));
 #endif
     return false;
 }