Fix thread unsafe mutex initialization.

src/pdf/SkPDFShader.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 "SkPDFShader.h"
@@ skipping 646 matching lines @@
             SkNEW_ARGS(State, (shader, matrix, surfaceBBox)));
 }
 
 // static
 SkTDArray<SkPDFShader::ShaderCanonicalEntry>& SkPDFShader::CanonicalShaders() {
     SkPDFShader::CanonicalShadersMutex().assertHeld();
     static SkTDArray<ShaderCanonicalEntry> gCanonicalShaders;
     return gCanonicalShaders;
 }
 
+SK_DECLARE_STATIC_MUTEX(gCanonicalShadersMutex);
 // static
 SkBaseMutex& SkPDFShader::CanonicalShadersMutex() {
-    SK_DECLARE_STATIC_MUTEX(gCanonicalShadersMutex);
     return gCanonicalShadersMutex;
 }
 
 // static
 SkPDFObject* SkPDFFunctionShader::RangeObject() {
     SkPDFShader::CanonicalShadersMutex().assertHeld();
     static SkPDFArray* range = NULL;
     // This method is only used with CanonicalShadersMutex, so it's safe to
     // populate domain.
     if (range == NULL) {
@@ skipping 657 matching lines @@
     return false;
 }
 
 void SkPDFShader::State::AllocateGradientInfoStorage() {
     fColorData.set(sk_malloc_throw(
                fInfo.fColorCount * (sizeof(SkColor) + sizeof(SkScalar))));
     fInfo.fColors = reinterpret_cast<SkColor*>(fColorData.get());
     fInfo.fColorOffsets =
             reinterpret_cast<SkScalar*>(fInfo.fColors + fInfo.fColorCount);
 }