Fix/suppress libs/vr google-explicit-constructor warnings

* Add explicit to conversion constructors/operators
* Use NOLINT or NOLINTNEXTLINE to suppress warnings on intended converters

Bug: 28341362
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,google-explicit-constructor
Change-Id: I3631041531e3fb5cbcee246a7e7bb94fb06aa60b
diff --git a/libs/vr/libpdx/private/pdx/channel_handle.h b/libs/vr/libpdx/private/pdx/channel_handle.h
index daa08f4..bd04305 100644
--- a/libs/vr/libpdx/private/pdx/channel_handle.h
+++ b/libs/vr/libpdx/private/pdx/channel_handle.h
@@ -26,7 +26,7 @@
 class ChannelHandleBase {
  public:
   ChannelHandleBase() = default;
-  ChannelHandleBase(const int32_t& value) : value_{value} {}
+  explicit ChannelHandleBase(const int32_t& value) : value_{value} {}
 
   ChannelHandleBase(const ChannelHandleBase&) = delete;
   ChannelHandleBase& operator=(const ChannelHandleBase&) = delete;
diff --git a/libs/vr/libpdx/private/pdx/client.h b/libs/vr/libpdx/private/pdx/client.h
index c35dabd..7e2d55c 100644
--- a/libs/vr/libpdx/private/pdx/client.h
+++ b/libs/vr/libpdx/private/pdx/client.h
@@ -206,7 +206,7 @@
 class Transaction final : public OutputResourceMapper,
                           public InputResourceMapper {
  public:
-  Transaction(Client& client);
+  explicit Transaction(Client& client);
   ~Transaction();
 
   template <typename T>
diff --git a/libs/vr/libpdx/private/pdx/rpc/buffer_wrapper.h b/libs/vr/libpdx/private/pdx/rpc/buffer_wrapper.h
index 0421220..43184dd 100644
--- a/libs/vr/libpdx/private/pdx/rpc/buffer_wrapper.h
+++ b/libs/vr/libpdx/private/pdx/rpc/buffer_wrapper.h
@@ -110,10 +110,10 @@
   using const_iterator = typename BufferType::const_iterator;
 
   BufferWrapper() {}
-  BufferWrapper(const BufferType& buffer) : buffer_(buffer) {}
+  explicit BufferWrapper(const BufferType& buffer) : buffer_(buffer) {}
   BufferWrapper(const BufferType& buffer, const Allocator& allocator)
       : buffer_(buffer, allocator) {}
-  BufferWrapper(BufferType&& buffer) : buffer_(std::move(buffer)) {}
+  explicit BufferWrapper(BufferType&& buffer) : buffer_(std::move(buffer)) {}
   BufferWrapper(BufferType&& buffer, const Allocator& allocator)
       : buffer_(std::move(buffer), allocator) {}
   BufferWrapper(const BufferWrapper&) = default;
diff --git a/libs/vr/libpdx/private/pdx/rpc/payload.h b/libs/vr/libpdx/private/pdx/rpc/payload.h
index a48a64c..d2df14f 100644
--- a/libs/vr/libpdx/private/pdx/rpc/payload.h
+++ b/libs/vr/libpdx/private/pdx/rpc/payload.h
@@ -83,7 +83,7 @@
                        public MessageWriter,
                        public MessageReader {
  public:
-  ServicePayload(Message& message) : message_(message) {}
+  explicit ServicePayload(Message& message) : message_(message) {}
 
   // MessageWriter
   void* GetNextWriteBufferSection(size_t size) override {
@@ -120,7 +120,8 @@
       MessageBuffer<ThreadLocalTypeSlot<ClientPayload<Slot>>, 1024u, int>;
   using BufferType = typename ContainerType::BufferType;
 
-  ClientPayload(Transaction& transaction) : transaction_{transaction} {}
+  explicit ClientPayload(Transaction& transaction)
+      : transaction_{transaction} {}
 
   // MessageWriter
   void* GetNextWriteBufferSection(size_t size) override {
diff --git a/libs/vr/libpdx/private/pdx/rpc/pointer_wrapper.h b/libs/vr/libpdx/private/pdx/rpc/pointer_wrapper.h
index 1cb85de..88868fe 100644
--- a/libs/vr/libpdx/private/pdx/rpc/pointer_wrapper.h
+++ b/libs/vr/libpdx/private/pdx/rpc/pointer_wrapper.h
@@ -13,7 +13,7 @@
  public:
   using BaseType = T;
 
-  PointerWrapper(T* pointer) : pointer_(pointer) {}
+  explicit PointerWrapper(T* pointer) : pointer_(pointer) {}
   PointerWrapper(const PointerWrapper&) = default;
   PointerWrapper(PointerWrapper&&) noexcept = default;
   PointerWrapper& operator=(const PointerWrapper&) = default;
diff --git a/libs/vr/libpdx/private/pdx/rpc/serialization.h b/libs/vr/libpdx/private/pdx/rpc/serialization.h
index f12aef1..914ea66 100644
--- a/libs/vr/libpdx/private/pdx/rpc/serialization.h
+++ b/libs/vr/libpdx/private/pdx/rpc/serialization.h
@@ -134,7 +134,7 @@
 
   // ErrorType constructor for generic error codes. Explicitly not explicit,
   // implicit conversion from ErrorCode to ErrorType is desirable behavior.
-  // NOLINTNEXTLINE(runtime/explicit)
+  // NOLINTNEXTLINE(google-explicit-constructor)
   ErrorType(ErrorCode error_code) : error_code_(error_code) {}
 
   // ErrorType constructor for encoding type errors.
@@ -148,6 +148,7 @@
   // Evaluates to true if the ErrorType represents an error.
   explicit operator bool() const { return error_code_ != ErrorCode::NO_ERROR; }
 
+  // NOLINTNEXTLINE(google-explicit-constructor)
   operator ErrorCode() const { return error_code_; }
   ErrorCode error_code() const { return error_code_; }
 
@@ -159,6 +160,7 @@
     return unexpected_encoding_.encoding_type;
   }
 
+  // NOLINTNEXTLINE(google-explicit-constructor)
   operator std::string() const {
     std::ostringstream stream;
 
diff --git a/libs/vr/libpdx/private/pdx/service.h b/libs/vr/libpdx/private/pdx/service.h
index 234b24a..853d53c 100644
--- a/libs/vr/libpdx/private/pdx/service.h
+++ b/libs/vr/libpdx/private/pdx/service.h
@@ -86,7 +86,7 @@
 class Message : public OutputResourceMapper, public InputResourceMapper {
  public:
   Message();
-  Message(const MessageInfo& info);
+  explicit Message(const MessageInfo& info);
   ~Message();
 
   /*
diff --git a/libs/vr/libpdx/private/pdx/status.h b/libs/vr/libpdx/private/pdx/status.h
index 7e51a52..498dd6d 100644
--- a/libs/vr/libpdx/private/pdx/status.h
+++ b/libs/vr/libpdx/private/pdx/status.h
@@ -11,6 +11,7 @@
 // This is a helper class for constructing Status<T> with an error code.
 struct ErrorStatus {
  public:
+  // NOLINTNEXTLINE(google-explicit-constructor)
   ErrorStatus(int error) : error_{error} {}
   int error() const { return error_; }
 
@@ -31,12 +32,14 @@
   // Value copy/move constructors. These are intentionally not marked as
   // explicit to allow direct value returns from functions without having
   // to explicitly wrap them into Status<T>().
-  Status(const T& value) : value_{value} {}        // NOLINT(runtime/explicit)
-  Status(T&& value) : value_{std::move(value)} {}  // NOLINT(runtime/explicit)
+  // NOLINTNEXTLINE(google-explicit-constructor)
+  Status(const T& value) : value_{value} {}
+  // NOLINTNEXTLINE(google-explicit-constructor)
+  Status(T&& value) : value_{std::move(value)} {}
 
   // Constructor for storing an error code inside the Status object.
-  Status(const ErrorStatus& error_status)  // NOLINT(runtime/explicit)
-      : error_{error_status.error()} {}
+  // NOLINTNEXTLINE(google-explicit-constructor)
+  Status(const ErrorStatus& error_status) : error_{error_status.error()} {}
 
   // Copy/move constructors. Move constructor leaves |other| object in empty
   // state.
@@ -135,8 +138,8 @@
 class Status<void> {
  public:
   Status() = default;
-  Status(const ErrorStatus& error_status)  // NOLINT(runtime/explicit)
-      : error_{error_status.error()} {}
+  // NOLINTNEXTLINE(google-explicit-constructor)
+  Status(const ErrorStatus& error_status) : error_{error_status.error()} {}
   void SetValue() { error_ = 0; }
   void SetError(int error) { error_ = error; }
 
diff --git a/libs/vr/libpdx/serialization_tests.cpp b/libs/vr/libpdx/serialization_tests.cpp
index 5ad1047..ee800f6 100644
--- a/libs/vr/libpdx/serialization_tests.cpp
+++ b/libs/vr/libpdx/serialization_tests.cpp
@@ -70,7 +70,7 @@
   FileHandleType fd;
 
   TestTemplateType() {}
-  TestTemplateType(FileHandleType fd) : fd(std::move(fd)) {}
+  explicit TestTemplateType(FileHandleType fd) : fd(std::move(fd)) {}
 
   bool operator==(const TestTemplateType& other) const {
     return fd.Get() == other.fd.Get();
diff --git a/libs/vr/libpdx/variant_tests.cpp b/libs/vr/libpdx/variant_tests.cpp
index e3520f5..a977fd3 100644
--- a/libs/vr/libpdx/variant_tests.cpp
+++ b/libs/vr/libpdx/variant_tests.cpp
@@ -14,18 +14,22 @@
 namespace {
 
 struct BaseType {
+  // NOLINTNEXTLINE(google-explicit-constructor)
   BaseType(int value) : value(value) {}
   int value;
 };
 
 struct DerivedType : BaseType {
+  // NOLINTNEXTLINE(google-explicit-constructor)
   DerivedType(int value) : BaseType{value} {};
 };
 
 template <typename T>
 class TestType {
  public:
+  // NOLINTNEXTLINE(google-explicit-constructor)
   TestType(const T& value) : value_(value) {}
+  // NOLINTNEXTLINE(google-explicit-constructor)
   TestType(T&& value) : value_(std::move(value)) {}
   TestType(const TestType&) = default;
   TestType(TestType&&) = default;
@@ -43,7 +47,9 @@
 template <typename T>
 class InstrumentType {
  public:
+  // NOLINTNEXTLINE(google-explicit-constructor)
   InstrumentType(const T& value) : value_(value) { constructor_count_++; }
+  // NOLINTNEXTLINE(google-explicit-constructor)
   InstrumentType(T&& value) : value_(std::move(value)) { constructor_count_++; }
   InstrumentType(const InstrumentType& other) : value_(other.value_) {
     constructor_count_++;
@@ -51,9 +57,11 @@
   InstrumentType(InstrumentType&& other) : value_(std::move(other.value_)) {
     constructor_count_++;
   }
+  // NOLINTNEXTLINE(google-explicit-constructor)
   InstrumentType(const TestType<T>& other) : value_(other.get()) {
     constructor_count_++;
   }
+  // NOLINTNEXTLINE(google-explicit-constructor)
   InstrumentType(TestType<T>&& other) : value_(other.take()) {
     constructor_count_++;
   }
@@ -1101,6 +1109,7 @@
 TEST(Variant, IsConstructible) {
   using ArrayType = const float[3];
   struct ImplicitBool {
+    // NOLINTNEXTLINE(google-explicit-constructor)
     operator bool() const { return true; }
   };
   struct ExplicitBool {