use tryAllocPixels to check the result, allocPixels to require success

Source/platform/DragImage.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 71 matching lines @@
 
         if (shouldRespectImageOrientation == RespectImageOrientation)
             orientation = bitmapImage->currentFrameOrientation();
 
         if (orientation != DefaultImageOrientation) {
             FloatRect destRect(FloatPoint(), sizeRespectingOrientation);
             if (orientation.usesWidthAsHeight())
                 destRect = destRect.transposedRect();
 
             SkBitmap skBitmap;
-            if (!skBitmap.allocN32Pixels(sizeRespectingOrientation.width(), sizeRespectingOrientation.height()))
+            if (!skBitmap.tryAllocN32Pixels(sizeRespectingOrientation.width(), sizeRespectingOrientation.height()))
                 return nullptr;
 
             SkCanvas canvas(skBitmap);
             canvas.concat(affineTransformToSkMatrix(orientation.transformFromDefault(sizeRespectingOrientation)));
             canvas.drawBitmapRect(bitmap->bitmap(), 0, destRect);
 
             return adoptPtr(new DragImage(skBitmap, deviceScaleFactor));
         }
     }
 
@@ skipping 160 matching lines @@
             *pixel = SkPreMultiplyARGB(
                 SkColorGetA(*pixel) * fraction,
                 SkColorGetR(*pixel),
                 SkColorGetG(*pixel),
                 SkColorGetB(*pixel));
         }
     }
 }
 
 } // namespace blink