make allocPixels throw on failure

samplecode/SampleFilterFuzz.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SampleCode.h"
 #include "SkAlphaThresholdFilter.h"
 #include "SkBitmapSource.h"
 #include "SkBlurImageFilter.h"
@@ skipping 135 matching lines @@
 
 static SkColorType rand_colortype() {
     return (SkColorType)R(kLastEnum_SkColorType + 1);
 }
 
 static void rand_bitmap_for_canvas(SkBitmap* bitmap) {
     SkImageInfo info;
     do {
         info = SkImageInfo::Make(kBitmapSize, kBitmapSize, rand_colortype(),
                                  kPremul_SkAlphaType);
-    } while (!valid_for_raster_canvas(info) || !bitmap->allocPixels(info));
+    } while (!valid_for_raster_canvas(info) || !bitmap->tryAllocPixels(info));
 }
 
 static void make_g_bitmap(SkBitmap& bitmap) {
     rand_bitmap_for_canvas(&bitmap);
 
     SkCanvas canvas(bitmap);
     canvas.clear(0x00000000);
     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setColor(0xFF884422);
@@ skipping 308 matching lines @@
     }
 
 private:
     typedef SkView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ImageFilterFuzzView; }
 static SkViewRegister reg(MyFactory);