Implement position: sticky updates on compositor

third_party/WebKit/public/platform/WebLayerStickyPositionConstraint.h

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-#ifndef DeviceRotationRate_h
-#define DeviceRotationRate_h
-
-#include "bindings/core/v8/ScriptWrappable.h"
-#include "modules/device_orientation/DeviceMotionData.h"
-#include "platform/heap/Handle.h"
+#ifndef WebLayerStickyPositionConstraint_h
+#define WebLayerStickyPositionConstraint_h
 
 namespace blink {
 
-class DeviceRotationRate final : public GarbageCollected<DeviceRotationRate>, public ScriptWrappable {
-    DEFINE_WRAPPERTYPEINFO();
-public:
-    static DeviceRotationRate* create(DeviceMotionData::RotationRate* rotationRate)
+// TODO(flackr): Combine with WebLayerPositionConstraint.
+struct WebLayerStickyPositionConstraint {
+    bool isSticky         : 1;
+    bool isAnchoredLeft   : 1;
+    bool isAnchoredRight  : 1;
+    bool isAnchoredTop    : 1;
+    bool isAnchoredBottom : 1;
+    float leftOffset;
+    float rightOffset;
+    float topOffset;
+    float bottomOffset;
+    WebRect absoluteStickyBoxRect;
+    WebRect absoluteContainingBlockRect;
+    WebLayerStickyPositionConstraint()
+        : isSticky(false)
+        , isAnchoredLeft(false)
+        , isAnchoredRight(false)
+        , isAnchoredTop(false)
+        , isAnchoredBottom(false)
+        , leftOffset(0.f)
+        , rightOffset(0.f)
+        , topOffset(0.f)
+        , bottomOffset(0.f)
     {
-        return new DeviceRotationRate(rotationRate);
     }
-    DECLARE_TRACE();
-
-    double alpha(bool& isNull) const;
-    double beta(bool& isNull) const;
-    double gamma(bool& isNull) const;
-
-private:
-    explicit DeviceRotationRate(DeviceMotionData::RotationRate*);
-
-    Member<DeviceMotionData::RotationRate> m_rotationRate;
 };
 
 } // namespace blink
 
-#endif // DeviceRotationRate_h
+#endif // WebLayerStickyPositionConstraint_h
+