Pre-cache local matrix type in shader constructor.

src/core/SkShader.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 "SkBitmapProcShader.h"
 #include "SkColorShader.h"
 #include "SkEmptyShader.h"
@@ skipping 26 matching lines @@
 #endif
 }
 
 SkShader::SkShader(const SkMatrix* localMatrix) {
     inc_shader_counter();
     if (localMatrix) {
         fLocalMatrix = *localMatrix;
     } else {
         fLocalMatrix.reset();
     }
+    // Pre-cache so future calls to fLocalMatrix.getType() are threadsafe.
+    (void)fLocalMatrix.getType();
 }
 
 SkShader::~SkShader() {
     dec_shader_counter();
 }
 
 void SkShader::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     bool hasLocalM = !fLocalMatrix.isIdentity();
     buffer.writeBool(hasLocalM);
@@ skipping 328 matching lines @@
 #include "SkEmptyShader.h"
 
 void SkEmptyShader::toString(SkString* str) const {
     str->append("SkEmptyShader: (");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif