Revert of SK_DECLARE_STATIC_MUTEX -> static SkMutex

src/core/SkPaint.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 "SkPaint.h"
 #include "SkAutoKern.h"
 #include "SkChecksum.h"
@@ skipping 1439 matching lines @@
     typeface->onFilterRec(rec);
 
     // be sure to call PostMakeRec(rec) before you actually use it!
 }
 
 /**
  * In order to call cachedDeviceLuminance, cachedPaintLuminance, or
  * cachedMaskGamma the caller must hold the gMaskGammaCacheMutex and continue
  * to hold it until the returned pointer is refed or forgotten.
  */
-static SkMutex gMaskGammaCacheMutex;
+SK_DECLARE_STATIC_MUTEX(gMaskGammaCacheMutex);
 
 static SkMaskGamma* gLinearMaskGamma = nullptr;
 static SkMaskGamma* gMaskGamma = nullptr;
 static SkScalar gContrast = SK_ScalarMin;
 static SkScalar gPaintGamma = SK_ScalarMin;
 static SkScalar gDeviceGamma = SK_ScalarMin;
 /**
  * The caller must hold the gMaskGammaCacheMutex and continue to hold it until
  * the returned SkMaskGamma pointer is refed or forgotten.
  */
@@ skipping 849 matching lines @@
 }
 
 uint32_t SkPaint::getHash() const {
     // We're going to hash 10 pointers and 7 32-bit values, finishing up with fBitfields,
     // so fBitfields should be 10 pointers and 6 32-bit values from the start.
     static_assert(offsetof(SkPaint, fBitfields) == 9 * sizeof(void*) + 6 * sizeof(uint32_t),
                   "SkPaint_notPackedTightly");
     return SkChecksum::Murmur3(reinterpret_cast<const uint32_t*>(this),
                                offsetof(SkPaint, fBitfields) + sizeof(fBitfields));
 }