WIP - compositor worker mega patch.

third_party/WebKit/public/platform/WebMutation.h

+#ifndef WebMutation_h
+#define WebMutation_h
+
+#include "third_party/skia/include/utils/SkMatrix44.h"
+
+#include <map>
+
+namespace blink {
+
+struct WebMutation {
+public:
+    enum MutationFlags {
+        MutationFlagsNone = 0,
+        MutationFlagsOpacity = 1 << 0,
+        MutationFlagsScrollLeft = 1 << 1,
+        MutationFlagsScrollTop = 1 << 2,
+        MutationFlagsTransform = 1 << 3,
+        MutationFlagsConnected = 1 << 4,
+    };
+
+    void setOpacity(float opacity)
+    {
+        m_mutatedFlags |= MutationFlagsOpacity;
+        m_opacity = opacity;
+    }
+    void setScrollLeft(float scrollLeft)
+    {
+        m_mutatedFlags |= MutationFlagsScrollLeft;
+        m_scrollLeft = scrollLeft;
+    }
+    void setScrollTop(float scrollTop)
+    {
+        m_mutatedFlags |= MutationFlagsScrollTop;
+        m_scrollTop = scrollTop;
+    }
+    void setTransform(const SkMatrix44& transform)
+    {
+        m_mutatedFlags |= MutationFlagsTransform;
+        m_transform = transform;
+    }
+    void disconnect()
+    {
+        m_mutatedFlags |= MutationFlagsConnected;
+    }
+
+    bool isOpacityMutated() const { return !!(m_mutatedFlags & MutationFlagsOpacity); }
+    bool isScrollLeftMutated() const { return !!(m_mutatedFlags & MutationFlagsScrollLeft); }
+    bool isScrollTopMutated() const { return !!(m_mutatedFlags & MutationFlagsScrollTop); }
+    bool isTransformMutated() const { return !!(m_mutatedFlags & MutationFlagsTransform); }
+    bool isConnectedMutated() const { return !!(m_mutatedFlags & MutationFlagsConnected); }
+
+    float opacity() const { return m_opacity; }
+    float scrollLeft() const { return m_scrollLeft; }
+    float scrollTop() const { return m_scrollTop; }
+    SkMatrix44 transform() const { return m_transform; }
+
+private:
+    uint32_t m_mutatedFlags = 0;
+    float m_opacity = 0;
+    float m_scrollLeft = 0;
+    float m_scrollTop = 0;
+    SkMatrix44 m_transform;
+};
+
+typedef std::map<uint64_t, WebMutation> WebMutationMap;
+
+} // namespace blink
+
+#endif // WebMutation_h