[S.P.] Don't draw frames of animated images that are offscreen

Source/platform/graphics/BitmapImage.cpp

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 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
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 }
 
 String BitmapImage::filenameExtension() const
 {
     return m_source.filenameExtension();
 }
 
 void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, SkXfermode::Mode compositeOp, RespectImageOrientationEnum shouldRespectImageOrientation)
 {
     TRACE_EVENT0("skia", "BitmapImage::draw");
-
     SkBitmap bitmap;
     if (!bitmapForCurrentFrame(&bitmap))
         return; // It's too early and we don't have an image yet.
 
     FloatRect normDstRect = adjustForNegativeSize(dstRect);
     FloatRect normSrcRect = adjustForNegativeSize(srcRect);
     normSrcRect.intersect(FloatRect(0, 0, bitmap.width(), bitmap.height()));
 
     if (normSrcRect.isEmpty() || normDstRect.isEmpty())
         return; // Nothing to draw.
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     return m_isSolidColor && !m_currentFrame;
 }
 
 Color BitmapImage::solidColor() const
 {
     return m_solidColor;
 }
 
 } // namespace blink