Refactor shadow rendering logic.

Source/core/platform/graphics/GraphicsContextState.h

Index: Source/core/platform/graphics/GraphicsContextState.h
diff --git a/Source/core/platform/graphics/GraphicsContextState.h b/Source/core/platform/graphics/GraphicsContextState.h
index 9d27ba4dbbfe376600305568a08769d2524b61cb..dbf98d60a432c29df4b308a69e008db5a9b025bb 100644
--- a/Source/core/platform/graphics/GraphicsContextState.h
+++ b/Source/core/platform/graphics/GraphicsContextState.h
@@ -36,6 +36,7 @@
 #include "core/platform/graphics/Pattern.h"
 
 #include "third_party/skia/include/core/SkColorPriv.h"
+#include "third_party/skia/include/core/SkDrawLooper.h"
 #include "third_party/skia/include/effects/SkDashPathEffect.h"
 
 #include "wtf/PassOwnPtr.h"
@@ -70,12 +71,10 @@ private:
         , m_fillColorPacked(0xFF000000)
         , m_fillColorSpace(ColorSpaceDeviceRGB)
         , m_fillRule(RULE_NONZERO)
-        , m_shadowBlur(0)
-        , m_shadowColorSpace(ColorSpaceDeviceRGB)
+        , m_looper(0)
         , m_textDrawingMode(TextModeFill)
         , m_alpha(1)
         , m_xferMode(SkXfermode::kSrcOver_Mode)
-        , m_looper(0)
         , m_compositeOperator(CompositeSourceOver)
         , m_blendMode(BlendModeNormal)
         , m_clip(SkRect::MakeEmpty())
@@ -110,14 +109,10 @@ private:
         , m_fillRule(other.m_fillRule)
         , m_fillGradient(other.m_fillGradient)
         , m_fillPattern(other.m_fillPattern)
-        , m_shadowBlur(other.m_shadowBlur)
-        , m_shadowColor(other.m_shadowColor)
-        , m_shadowOffset(other.m_shadowOffset)
-        , m_shadowColorSpace(other.m_shadowColorSpace)
+        , m_looper(other.m_looper)
         , m_textDrawingMode(other.m_textDrawingMode)
         , m_alpha(other.m_alpha)
         , m_xferMode(other.m_xferMode)
-        , m_looper(other.m_looper)
         , m_compositeOperator(other.m_compositeOperator)
         , m_blendMode(other.m_blendMode)
         , m_imageBufferClip(other.m_imageBufferClip)
@@ -179,11 +174,8 @@ private:
     RefPtr<Gradient> m_fillGradient;
     RefPtr<Pattern> m_fillPattern;
 
-    // Shadow.
-    float m_shadowBlur;
-    Color m_shadowColor;
-    FloatSize m_shadowOffset;
-    ColorSpace m_shadowColorSpace;
+    // Shadow. (This will need tweaking if we use draw loopers for other things.)
+    SkDrawLooper* m_looper;
 
     // Text. (See TextModeFill & friends.)
     TextDrawingModeFlags m_textDrawingMode;
@@ -191,7 +183,6 @@ private:
     // Common shader state.
     float m_alpha;
     SkXfermode::Mode m_xferMode;
-    SkDrawLooper* m_looper;
 
     // Compositing control, for the CSS and Canvas compositing spec.
     CompositeOperator m_compositeOperator;