Fix thread unsafe mutex initialization.

src/ports/SkFontHost_mac.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <vector>
 #ifdef SK_BUILD_FOR_MAC
@@ skipping 508 matching lines @@
                 CTFontDescriptorCreateWithAttributes(cfAttributes));
 
         if (ctFontDesc != NULL) {
             ctFont = CTFontCreateWithFontDescriptor(ctFontDesc, 0, NULL);
         }
     }
 
     return ctFont ? NewFromFontRef(ctFont, familyName, false) : NULL;
 }
 
+SK_DECLARE_STATIC_MUTEX(gGetDefaultFaceMutex);
 static SkTypeface* GetDefaultFace() {
-    SK_DECLARE_STATIC_MUTEX(gMutex);
-    SkAutoMutexAcquire ma(gMutex);
+    SkAutoMutexAcquire ma(gGetDefaultFaceMutex);
 
     static SkTypeface* gDefaultFace;
 
     if (NULL == gDefaultFace) {
         gDefaultFace = NewFromName(FONT_DEFAULT_NAME, SkTypeface::kNormal);
         SkTypefaceCache::Add(gDefaultFace, SkTypeface::kNormal);
     }
     return gDefaultFace;
 }
 
@@ skipping 1762 matching lines @@
         return create_typeface(NULL, familyName, (SkTypeface::Style)styleBits);
     }
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkFontMgr* SkFontMgr::Factory() {
     return SkNEW(SkFontMgr_Mac);
 }
 #endif