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

Source/core/platform/graphics/filters/FEBlend.cpp

Index: Source/core/platform/graphics/filters/FEBlend.cpp
diff --git a/Source/core/platform/graphics/filters/FEBlend.cpp b/Source/core/platform/graphics/filters/FEBlend.cpp
index 42e2bc6de0be944df374db6c0297094626741457..aa9f6f7124095a8bb6852946fdb85dad9e25e027 100644
--- a/Source/core/platform/graphics/filters/FEBlend.cpp
+++ b/Source/core/platform/graphics/filters/FEBlend.cpp
@@ -33,7 +33,8 @@
 #include "core/platform/text/TextStream.h"
 #include "core/rendering/RenderTreeAsText.h"
 
-#include <wtf/Uint8ClampedArray.h>
+#include "wtf/MathExtras.h"
+#include "wtf/Uint8ClampedArray.h"
 
 #include "SkBitmapSource.h"
 #include "SkBlendImageFilter.h"
@@ -68,13 +69,7 @@ bool FEBlend::setBlendMode(BlendModeType mode)
     return true;
 }
 
-static inline unsigned char fastDivideBy255(uint16_t value)
-{
-    // This is an approximate algorithm for division by 255, but it gives accurate results for 16bit values.
-    uint16_t quotient = value >> 8;
-    uint16_t remainder = value - (quotient * 255) + 1;
-    return quotient + (remainder >> 8);
-}
+using WTF::fastDivideBy255;
 
 inline unsigned char feBlendNormal(unsigned char colorA, unsigned char colorB, unsigned char alphaA, unsigned char)
 {