use tryAllocPixels to check the result, allocPixels to require success

Source/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 935 matching lines @@
     if (canvasBitmap.width() == width && canvasBitmap.height() == height) {
         // This is the fastest and most common case. We read back
         // directly into the canvas's backing store.
         readbackBitmap = &canvasBitmap;
         m_resizingBitmap.reset();
     } else {
         // We need to allocate a temporary bitmap for reading back the
         // pixel data. We will then use Skia to rescale this bitmap to
         // the size of the canvas's backing store.
         if (m_resizingBitmap.width() != width || m_resizingBitmap.height() != height) {
-            if (!m_resizingBitmap.allocN32Pixels(width, height))
+            if (!m_resizingBitmap.tryAllocN32Pixels(width, height))
                 return;
         }
         readbackBitmap = &m_resizingBitmap;
     }
 
     // Read back the frame buffer.
     SkAutoLockPixels bitmapLock(*readbackBitmap);
     pixels = static_cast<unsigned char*>(readbackBitmap->getPixels());
 
     m_context->bindFramebuffer(GL_FRAMEBUFFER, framebuffer);
@@ skipping 80 matching lines @@
 void DrawingBuffer::deleteChromiumImageForTexture(TextureInfo* info)
 {
     if (info->imageId) {
         m_context->releaseTexImage2DCHROMIUM(GL_TEXTURE_2D, info->imageId);
         m_context->destroyImageCHROMIUM(info->imageId);
         info->imageId = 0;
     }
 }
 
 } // namespace blink