Implement will-change-based GPU rasterization hint

Source/platform/graphics/GraphicsLayer.h

Index: Source/platform/graphics/GraphicsLayer.h
diff --git a/Source/platform/graphics/GraphicsLayer.h b/Source/platform/graphics/GraphicsLayer.h
index 507ac945f0da6919c75c248aba39a6b7ba8b211c..f98f058e71b38b4789c97f5f9ba02cf746cfc21a 100644
--- a/Source/platform/graphics/GraphicsLayer.h
+++ b/Source/platform/graphics/GraphicsLayer.h
@@ -205,6 +205,9 @@ public:
     bool isRootForIsolatedGroup() const { return m_isRootForIsolatedGroup; }
     void setIsRootForIsolatedGroup(bool);
 
+    bool hasGpuRasterizationHint() const { return m_hasGpuRasterizationHint; }
+    void setHasGpuRasterizationHint(bool);
+
     const FilterOperations& filters() const { return m_filters; }
 
     // Returns true if filter can be rendered by the compositor
@@ -359,6 +362,7 @@ private:
     bool m_drawsContent : 1;
     bool m_contentsVisible : 1;
     bool m_isRootForIsolatedGroup : 1;
+    bool m_hasGpuRasterizationHint: 1;
 
     bool m_hasScrollParent : 1;
     bool m_hasClipParent : 1;