Update from https://crrev.com/308331

sky/engine/platform/graphics/GraphicsContextRecorder.cpp

 /*
  * Copyright (C) 2013 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 82 matching lines @@
 {
     SkMemoryStream stream(data, size);
     RefPtr<SkPicture> picture = adoptRef(SkPicture::CreateFromStream(&stream, decodeBitmap));
     if (!picture)
         return nullptr;
     return adoptRef(new GraphicsContextSnapshot(picture));
 }
 
 PassOwnPtr<Vector<char> > GraphicsContextSnapshot::replay(unsigned fromStep, unsigned toStep, double scale) const
 {
-    int width = ceil(scale * m_picture->width());
-    int height = ceil(scale * m_picture->height());
+    const SkIRect bounds = m_picture->cullRect().roundOut();
     SkBitmap bitmap;
-    bitmap.allocPixels(SkImageInfo::MakeN32Premul(width, height));
+    bitmap.allocPixels(SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()));
     {
         ReplayingCanvas canvas(bitmap, fromStep, toStep);
         canvas.scale(scale, scale);
         canvas.resetStepCount();
         m_picture->draw(&canvas, &canvas);
     }
     OwnPtr<Vector<char> > base64Data = adoptPtr(new Vector<char>());
     Vector<char> encodedImage;
     if (!PNGImageEncoder::encode(bitmap, reinterpret_cast<Vector<unsigned char>*>(&encodedImage)))
         return nullptr;
     base64Encode(encodedImage, *base64Data);
     return base64Data.release();
 }
 
 PassOwnPtr<GraphicsContextSnapshot::Timings> GraphicsContextSnapshot::profile(unsigned minRepeatCount, double minDuration) const
 {
     OwnPtr<GraphicsContextSnapshot::Timings> timings = adoptPtr(new GraphicsContextSnapshot::Timings());
     timings->reserveCapacity(minRepeatCount);
+    const SkIRect bounds = m_picture->cullRect().roundOut();
     SkBitmap bitmap;
-    bitmap.allocPixels(SkImageInfo::MakeN32Premul(m_picture->width(), m_picture->height()));
+    bitmap.allocPixels(SkImageInfo::MakeN32Premul(bounds.width(), bounds.height()));
     OwnPtr<ProfilingCanvas> canvas = adoptPtr(new ProfilingCanvas(bitmap));
 
     double now = WTF::monotonicallyIncreasingTime();
     double stopTime = now + minDuration;
     for (unsigned step = 0; step < minRepeatCount || now < stopTime; ++step) {
         timings->append(Vector<double>());
         Vector<double>* currentTimings = &timings->last();
         if (timings->size() > 1)
             currentTimings->reserveCapacity(timings->begin()->size());
         if (step)
             canvas = adoptPtr(new ProfilingCanvas(bitmap));
         canvas->setTimings(currentTimings);
         m_picture->draw(canvas.get());
         now = WTF::monotonicallyIncreasingTime();
     }
     return timings.release();
 }
 
 PassRefPtr<JSONArray> GraphicsContextSnapshot::snapshotCommandLog() const
 {
-    LoggingCanvas canvas(m_picture->width(), m_picture->height());
+    const SkIRect bounds = m_picture->cullRect().roundOut();
+    LoggingCanvas canvas(bounds.width(), bounds.height());
     m_picture->draw(&canvas);
     return canvas.log();
 }
 
 } // namespace blink