Make leak counters thread-safe

gm/colormatrix.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 "gm.h"
 #include "SkColorMatrixFilter.h"
 #include "SkGradientShader.h"
 
 #define WIDTH 500
 #define HEIGHT 500
 
-class SkOnce {
+class SkDoOnce {
 public:
-    SkOnce() : fOnce(false) {};
+    SkDoOnce() : fOnce(false) {};
 
     bool once() const {
         if (fOnce) {
             return false;
         }
         fOnce = true;
         return true;
     }
 
 private:
     mutable bool fOnce;
 };
 
 static void setColorMatrix(SkPaint* paint, const SkColorMatrix& matrix) {
     paint->setColorFilter(SkNEW_ARGS(SkColorMatrixFilter, (matrix)))->unref();
 }
 
 static void setArray(SkPaint* paint, const SkScalar array[]) {
     paint->setColorFilter(SkNEW_ARGS(SkColorMatrixFilter, (array)))->unref();
 }
 
 namespace skiagm {
 
 class ColorMatrixGM : public GM {
-    SkOnce fOnce;
+    SkDoOnce fOnce;
     void init() {
         if (fOnce.once()) {
             fSolidBitmap = this->createSolidBitmap(64, 64);
             fTransparentBitmap = this->createTransparentBitmap(64, 64);
         }
     }
 
 public:
     ColorMatrixGM() {
         this->setBGColor(0xFF808080);
@@ skipping 115 matching lines @@
     SkBitmap fTransparentBitmap;
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new ColorMatrixGM; }
 static GMRegistry reg(MyFactory);
 
 }