Fix thread unsafe mutex initialization.

src/pdf/SkPDFGraphicState.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkData.h"
 #include "SkPDFFormXObject.h"
 #include "SkPDFGraphicState.h"
@@ skipping 70 matching lines @@
     return SkPDFDict::getOutputSize(catalog, indirect);
 }
 
 // static
 SkTDArray<SkPDFGraphicState::GSCanonicalEntry>& SkPDFGraphicState::CanonicalPaints() {
     CanonicalPaintsMutex().assertHeld();
     static SkTDArray<SkPDFGraphicState::GSCanonicalEntry> gCanonicalPaints;
     return gCanonicalPaints;
 }
 
+SK_DECLARE_STATIC_MUTEX(gCanonicalPaintsMutex);
 // static
 SkBaseMutex& SkPDFGraphicState::CanonicalPaintsMutex() {
-    SK_DECLARE_STATIC_MUTEX(gCanonicalPaintsMutex);
     return gCanonicalPaintsMutex;
 }
 
 // static
 SkPDFGraphicState* SkPDFGraphicState::GetGraphicStateForPaint(const SkPaint& paint) {
     SkAutoMutexAcquire lock(CanonicalPaintsMutex());
     int index = Find(paint);
     if (index >= 0) {
         CanonicalPaints()[index].fGraphicState->ref();
         return CanonicalPaints()[index].fGraphicState;
@@ skipping 174 matching lines @@
     }
     if (bXfermodeName < 0 || bXfermodeName > SkXfermode::kLastMode ||
             blend_mode_from_xfermode(bXfermodeName) == NULL) {
         bXfermodeName = SkXfermode::kSrcOver_Mode;
     }
     const char* bXfermodeString = blend_mode_from_xfermode(bXfermodeName);
     SkASSERT(bXfermodeString != NULL);
 
     return strcmp(aXfermodeString, bXfermodeString) == 0;
 }