Merge "Fix google-explicit-constructor warnings in vulkan."

class DebugReportLogger {

   public:

    DebugReportLogger(const VkInstanceCreateInfo& info)

    explicit DebugReportLogger(const VkInstanceCreateInfo& info)

        : instance_pnext_(info.pNext), callbacks_(nullptr) {}

    DebugReportLogger(const DebugReportCallbackList& callbacks)

    explicit DebugReportLogger(const DebugReportCallbackList& callbacks)

        : instance_pnext_(nullptr), callbacks_(&callbacks) {}

    void Message(VkDebugReportFlagsEXT flags,

VK_DEFINE_HANDLE(DeviceDispatchable)

struct InstanceData {

    InstanceData(const VkAllocationCallbacks& alloc)

    explicit InstanceData(const VkAllocationCallbacks& alloc)

        : opaque_api_data(),

          allocator(alloc),

          driver(),

class LayerRef {

   public:

    LayerRef(const Layer* layer);

    explicit LayerRef(const Layer* layer);

    LayerRef(LayerRef&& other);

    ~LayerRef();

    LayerRef(const LayerRef&) = delete;