Merge "Add LambdaMessage to SurfaceFlinger" into oc-dr1-dev

#include "Barrier.h"

#include <functional>

namespace android {

class IDisplayEventConnection;

    mutable Barrier barrier;

};

class LambdaMessage : public MessageBase {

public:

    explicit LambdaMessage(std::function<void()> handler)

          : MessageBase(), mHandler(std::move(handler)) {}

    bool handler() override {

        mHandler();

        // This return value is no longer checked, so it's always safe to return true

        return true;

    }

private:

    const std::function<void()> mHandler;

};

// ---------------------------------------------------------------------------

class MessageQueue {