Make image decoders faster by refactoring hot loops that fills the lines of ImageFrame.

Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp

Index: Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp
diff --git a/Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp b/Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp
index 26171f55dae281d37ebcb21ce8f08c8b957750ed..592c5e638aac442ae8d37b4267d7fd0f7a6a933c 100644
--- a/Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp
+++ b/Source/core/platform/image-decoders/webp/WEBPImageDecoder.cpp
@@ -193,9 +193,7 @@ void WEBPImageDecoder::applyColorProfile(const uint8_t* data, size_t dataSize, I
         uint8_t* row = reinterpret_cast<uint8_t*>(buffer.getAddr(0, y));
         if (qcms_transform* transform = colorTransform())
             qcms_transform_data_type(transform, row, row, width, QCMS_OUTPUT_RGBX);
-        uint8_t* pixel = row;
-        for (int x = 0; x < width; ++x, pixel += 4)
-            buffer.setRGBA(x, y, pixel[0], pixel[1], pixel[2], pixel[3]);
+        buffer.fillRowFromRGBASource(y, row);
     }
 
     m_decodedHeight = decodedHeight;