Merge "Revert "gpuDrawTime should default to 0 when endTime is unknown""

        // GPU start time is approximated to the moment before swapBuffer is invoked.

        // We could add an EGLSyncKHR fence at the beginning of the frame, but that is an overhead.

        int64_t endTime = get(FrameInfoIndex::GpuCompleted);

        return endTime > 0 ? endTime - get(FrameInfoIndex::SwapBuffers) : 0;

        return endTime > 0 ? endTime - get(FrameInfoIndex::SwapBuffers) : -1;

    }

    inline int64_t& set(FrameInfoIndex index) { return mFrameInfo[static_cast<int>(index)]; }