Update from https://crrev.com/308331

sky/engine/platform/graphics/GraphicsContextCullSaver.h

-#ifndef GraphicsContextCullSaver_h
-#define GraphicsContextCullSaver_h
-
-#include "sky/engine/platform/graphics/GraphicsContext.h"
-
-namespace blink {
-
-class FloatRect;
-
-class GraphicsContextCullSaver {
-    WTF_MAKE_FAST_ALLOCATED;
-public:
-    GraphicsContextCullSaver(GraphicsContext& context)
-        : m_context(context)
-        , m_cullApplied(false)
-    {
-    }
-
-    GraphicsContextCullSaver(GraphicsContext& context, const FloatRect& rect)
-        : m_context(context)
-        , m_cullApplied(true)
-    {
-        context.beginCull(rect);
-    }
-
-    ~GraphicsContextCullSaver()
-    {
-        if (m_cullApplied)
-            m_context.endCull();
-    }
-
-    void cull(const FloatRect& rect)
-    {
-        ASSERT(!m_cullApplied);
-        m_context.beginCull(rect);
-        m_cullApplied = true;
-    }
-
-private:
-    GraphicsContext& m_context;
-    bool m_cullApplied;
-};
-
-} // namespace blink
-
-#endif // GraphicsContextCullSaver_h