Correct a small mistake in ImageBitmap::copyBitmapData

third_party/WebKit/Source/core/frame/ImageBitmap.cpp

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/ImageBitmap.h"
 
 #include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLVideoElement.h"
 #include "core/html/ImageData.h"
 #include "third_party/skia/include/core/SkSurface.h"
@@ skipping 153 matching lines @@
 
 PassRefPtrWillBeRawPtr<ImageBitmap> ImageBitmap::create(PassRefPtr<StaticBitmapImage> image)
 {
     return adoptRefWillBeNoop(new ImageBitmap(image));
 }
 
 PassOwnPtr<uint8_t[]> ImageBitmap::copyBitmapData()
 {
     SkImageInfo info = SkImageInfo::Make(width(), height(), kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
     OwnPtr<uint8_t[]> dstPixels = adoptArrayPtr(new uint8_t[width() * height() * info.bytesPerPixel()]);
-    size_t dstRowBytes = 4 * width();
+    size_t dstRowBytes = info.bytesPerPixel() * width();
     m_image->imageForCurrentFrame()->readPixels(info, dstPixels.get(), dstRowBytes, 0, 0);
     return dstPixels.release();
 }
 
 unsigned long ImageBitmap::width() const
 {
     if (!m_image)
         return 0;
     ASSERT(m_image->width() > 0);
     return m_image->width();
@@ skipping 42 matching lines @@
 {
     return FloatSize(width(), height());
 }
 
 DEFINE_TRACE(ImageBitmap)
 {
     ImageLoaderClient::trace(visitor);
 }
 
 } // namespace blink