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diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/arena.cc b/third_party/protobuf/3.6.0/src/google/protobuf/arena.cc
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index 0000000000..c117c9e528
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+++ b/third_party/protobuf/3.6.0/src/google/protobuf/arena.cc
@@ -0,0 +1,415 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <google/protobuf/arena.h>
+
+#include <algorithm>
+#include <limits>
+
+
+#ifdef ADDRESS_SANITIZER
+#include <sanitizer/asan_interface.h>
+#endif  // ADDRESS_SANITIZER
+
+#include <google/protobuf/stubs/port.h>
+
+namespace google {
+static const size_t kMinCleanupListElements = 8;
+static const size_t kMaxCleanupListElements = 64;  // 1kB on 64-bit.
+
+namespace protobuf {
+namespace internal {
+
+
+std::atomic<int64> ArenaImpl::lifecycle_id_generator_;
+#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
+ArenaImpl::ThreadCache& ArenaImpl::thread_cache() {
+  static internal::ThreadLocalStorage<ThreadCache>* thread_cache_ =
+      new internal::ThreadLocalStorage<ThreadCache>();
+  return *thread_cache_->Get();
+}
+#elif defined(PROTOBUF_USE_DLLS)
+ArenaImpl::ThreadCache& ArenaImpl::thread_cache() {
+  static GOOGLE_THREAD_LOCAL ThreadCache thread_cache_ = { -1, NULL };
+  return thread_cache_;
+}
+#else
+GOOGLE_THREAD_LOCAL ArenaImpl::ThreadCache ArenaImpl::thread_cache_ = {-1, NULL};
+#endif
+
+void ArenaImpl::Init() {
+  lifecycle_id_ =
+      lifecycle_id_generator_.fetch_add(1, std::memory_order_relaxed);
+  hint_.store(nullptr, std::memory_order_relaxed);
+  threads_.store(nullptr, std::memory_order_relaxed);
+
+  if (initial_block_) {
+    // Thread which calls Init() owns the first block. This allows the
+    // single-threaded case to allocate on the first block without having to
+    // perform atomic operations.
+    new (initial_block_) Block(options_.initial_block_size, NULL);
+    SerialArena* serial =
+        SerialArena::New(initial_block_, &thread_cache(), this);
+    serial->set_next(NULL);
+    threads_.store(serial, std::memory_order_relaxed);
+    space_allocated_.store(options_.initial_block_size,
+                           std::memory_order_relaxed);
+    CacheSerialArena(serial);
+  } else {
+    space_allocated_.store(0, std::memory_order_relaxed);
+  }
+}
+
+ArenaImpl::~ArenaImpl() {
+  // Have to do this in a first pass, because some of the destructors might
+  // refer to memory in other blocks.
+  CleanupList();
+  FreeBlocks();
+}
+
+uint64 ArenaImpl::Reset() {
+  // Have to do this in a first pass, because some of the destructors might
+  // refer to memory in other blocks.
+  CleanupList();
+  uint64 space_allocated = FreeBlocks();
+  Init();
+
+  return space_allocated;
+}
+
+ArenaImpl::Block* ArenaImpl::NewBlock(Block* last_block, size_t min_bytes) {
+  size_t size;
+  if (last_block) {
+    // Double the current block size, up to a limit.
+    size = std::min(2 * last_block->size(), options_.max_block_size);
+  } else {
+    size = options_.start_block_size;
+  }
+  // Verify that min_bytes + kBlockHeaderSize won't overflow.
+  GOOGLE_CHECK_LE(min_bytes, std::numeric_limits<size_t>::max() - kBlockHeaderSize);
+  size = std::max(size, kBlockHeaderSize + min_bytes);
+
+  void* mem = options_.block_alloc(size);
+  Block* b = new (mem) Block(size, last_block);
+  space_allocated_.fetch_add(size, std::memory_order_relaxed);
+  return b;
+}
+
+ArenaImpl::Block::Block(size_t size, Block* next)
+    : next_(next), pos_(kBlockHeaderSize), size_(size) {}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void ArenaImpl::SerialArena::AddCleanupFallback(void* elem,
+                                                void (*cleanup)(void*)) {
+  size_t size = cleanup_ ? cleanup_->size * 2 : kMinCleanupListElements;
+  size = std::min(size, kMaxCleanupListElements);
+  size_t bytes = internal::AlignUpTo8(CleanupChunk::SizeOf(size));
+  CleanupChunk* list = reinterpret_cast<CleanupChunk*>(AllocateAligned(bytes));
+  list->next = cleanup_;
+  list->size = size;
+
+  cleanup_ = list;
+  cleanup_ptr_ = &list->nodes[0];
+  cleanup_limit_ = &list->nodes[size];
+
+  AddCleanup(elem, cleanup);
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_FUNC_ALIGN(32)
+void* ArenaImpl::AllocateAligned(size_t n) {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    return arena->AllocateAligned(n);
+  } else {
+    return AllocateAlignedFallback(n);
+  }
+}
+
+void* ArenaImpl::AllocateAlignedAndAddCleanup(size_t n,
+                                              void (*cleanup)(void*)) {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    return arena->AllocateAlignedAndAddCleanup(n, cleanup);
+  } else {
+    return AllocateAlignedAndAddCleanupFallback(n, cleanup);
+  }
+}
+
+void ArenaImpl::AddCleanup(void* elem, void (*cleanup)(void*)) {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    arena->AddCleanup(elem, cleanup);
+  } else {
+    return AddCleanupFallback(elem, cleanup);
+  }
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void* ArenaImpl::AllocateAlignedFallback(size_t n) {
+  return GetSerialArena()->AllocateAligned(n);
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void* ArenaImpl::AllocateAlignedAndAddCleanupFallback(size_t n,
+                                                      void (*cleanup)(void*)) {
+  return GetSerialArena()->AllocateAlignedAndAddCleanup(n, cleanup);
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void ArenaImpl::AddCleanupFallback(void* elem, void (*cleanup)(void*)) {
+  GetSerialArena()->AddCleanup(elem, cleanup);
+}
+
+inline GOOGLE_PROTOBUF_ATTRIBUTE_ALWAYS_INLINE
+bool ArenaImpl::GetSerialArenaFast(ArenaImpl::SerialArena** arena) {
+  // If this thread already owns a block in this arena then try to use that.
+  // This fast path optimizes the case where multiple threads allocate from the
+  // same arena.
+  ThreadCache* tc = &thread_cache();
+  if (GOOGLE_PREDICT_TRUE(tc->last_lifecycle_id_seen == lifecycle_id_)) {
+    *arena = tc->last_serial_arena;
+    return true;
+  }
+
+  // Check whether we own the last accessed SerialArena on this arena.  This
+  // fast path optimizes the case where a single thread uses multiple arenas.
+  SerialArena* serial = hint_.load(std::memory_order_acquire);
+  if (GOOGLE_PREDICT_TRUE(serial != NULL && serial->owner() == tc)) {
+    *arena = serial;
+    return true;
+  }
+
+  return false;
+}
+
+ArenaImpl::SerialArena* ArenaImpl::GetSerialArena() {
+  SerialArena* arena;
+  if (GOOGLE_PREDICT_TRUE(GetSerialArenaFast(&arena))) {
+    return arena;
+  } else {
+    return GetSerialArenaFallback(&thread_cache());
+  }
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+void* ArenaImpl::SerialArena::AllocateAlignedFallback(size_t n) {
+  // Sync back to current's pos.
+  head_->set_pos(head_->size() - (limit_ - ptr_));
+
+  head_ = arena_->NewBlock(head_, n);
+  ptr_ = head_->Pointer(head_->pos());
+  limit_ = head_->Pointer(head_->size());
+
+#ifdef ADDRESS_SANITIZER
+  ASAN_POISON_MEMORY_REGION(ptr_, limit_ - ptr_);
+#endif  // ADDRESS_SANITIZER
+
+  return AllocateAligned(n);
+}
+
+uint64 ArenaImpl::SpaceAllocated() const {
+  return space_allocated_.load(std::memory_order_relaxed);
+}
+
+uint64 ArenaImpl::SpaceUsed() const {
+  SerialArena* serial = threads_.load(std::memory_order_acquire);
+  uint64 space_used = 0;
+  for ( ; serial; serial = serial->next()) {
+    space_used += serial->SpaceUsed();
+  }
+  return space_used;
+}
+
+uint64 ArenaImpl::SerialArena::SpaceUsed() const {
+  // Get current block's size from ptr_ (since we can't trust head_->pos().
+  uint64 space_used = ptr_ - head_->Pointer(kBlockHeaderSize);
+  // Get subsequent block size from b->pos().
+  for (Block* b = head_->next(); b; b = b->next()) {
+    space_used += (b->pos() - kBlockHeaderSize);
+  }
+  // Remove the overhead of the SerialArena itself.
+  space_used -= kSerialArenaSize;
+  return space_used;
+}
+
+uint64 ArenaImpl::FreeBlocks() {
+  uint64 space_allocated = 0;
+  // By omitting an Acquire barrier we ensure that any user code that doesn't
+  // properly synchronize Reset() or the destructor will throw a TSAN warning.
+  SerialArena* serial = threads_.load(std::memory_order_relaxed);
+
+  while (serial) {
+    // This is inside a block we are freeing, so we need to read it now.
+    SerialArena* next = serial->next();
+    space_allocated += ArenaImpl::SerialArena::Free(serial, initial_block_,
+                                                    options_.block_dealloc);
+    // serial is dead now.
+    serial = next;
+  }
+
+  return space_allocated;
+}
+
+uint64 ArenaImpl::SerialArena::Free(ArenaImpl::SerialArena* serial,
+                                    Block* initial_block,
+                                    void (*block_dealloc)(void*, size_t)) {
+  uint64 space_allocated = 0;
+
+  // We have to be careful in this function, since we will be freeing the Block
+  // that contains this SerialArena.  Be careful about accessing |serial|.
+
+  for (Block* b = serial->head_; b; ) {
+    // This is inside the block we are freeing, so we need to read it now.
+    Block* next_block = b->next();
+    space_allocated += (b->size());
+
+#ifdef ADDRESS_SANITIZER
+    // This memory was provided by the underlying allocator as unpoisoned, so
+    // return it in an unpoisoned state.
+    ASAN_UNPOISON_MEMORY_REGION(b->Pointer(0), b->size());
+#endif  // ADDRESS_SANITIZER
+
+    if (b != initial_block) {
+      block_dealloc(b, b->size());
+    }
+
+    b = next_block;
+  }
+
+  return space_allocated;
+}
+
+void ArenaImpl::CleanupList() {
+  // By omitting an Acquire barrier we ensure that any user code that doesn't
+  // properly synchronize Reset() or the destructor will throw a TSAN warning.
+  SerialArena* serial = threads_.load(std::memory_order_relaxed);
+
+  for ( ; serial; serial = serial->next()) {
+    serial->CleanupList();
+  }
+}
+
+void ArenaImpl::SerialArena::CleanupList() {
+  if (cleanup_ != NULL) {
+    CleanupListFallback();
+  }
+}
+
+void ArenaImpl::SerialArena::CleanupListFallback() {
+  // Cleanup newest chunk: ptrs give us length.
+  size_t n = cleanup_ptr_ - &cleanup_->nodes[0];
+  CleanupNode* node = cleanup_ptr_;
+  for (size_t i = 0; i < n; i++) {
+    --node;
+    node->cleanup(node->elem);
+  }
+
+  // Cleanup older chunks, which are known to be full.
+  CleanupChunk* list = cleanup_->next;
+  while (list) {
+    size_t n = list->size;
+    CleanupNode* node = &list->nodes[list->size];
+    for (size_t i = 0; i < n; i++) {
+      --node;
+      node->cleanup(node->elem);
+    }
+    list = list->next;
+  }
+}
+
+ArenaImpl::SerialArena* ArenaImpl::SerialArena::New(Block* b, void* owner,
+                                                    ArenaImpl* arena) {
+  GOOGLE_DCHECK_EQ(b->pos(), kBlockHeaderSize);  // Should be a fresh block
+  GOOGLE_DCHECK_LE(kBlockHeaderSize + kSerialArenaSize, b->size());
+  SerialArena* serial =
+      reinterpret_cast<SerialArena*>(b->Pointer(kBlockHeaderSize));
+  b->set_pos(kBlockHeaderSize + kSerialArenaSize);
+  serial->arena_ = arena;
+  serial->owner_ = owner;
+  serial->head_ = b;
+  serial->ptr_ = b->Pointer(b->pos());
+  serial->limit_ = b->Pointer(b->size());
+  serial->cleanup_ = NULL;
+  serial->cleanup_ptr_ = NULL;
+  serial->cleanup_limit_ = NULL;
+  return serial;
+}
+
+GOOGLE_PROTOBUF_ATTRIBUTE_NOINLINE
+ArenaImpl::SerialArena* ArenaImpl::GetSerialArenaFallback(void* me) {
+  // Look for this SerialArena in our linked list.
+  SerialArena* serial = threads_.load(std::memory_order_acquire);
+  for ( ; serial; serial = serial->next()) {
+    if (serial->owner() == me) {
+      break;
+    }
+  }
+
+  if (!serial) {
+    // This thread doesn't have any SerialArena, which also means it doesn't
+    // have any blocks yet.  So we'll allocate its first block now.
+    Block* b = NewBlock(NULL, kSerialArenaSize);
+    serial = SerialArena::New(b, me, this);
+
+    SerialArena* head = threads_.load(std::memory_order_relaxed);
+    do {
+      serial->set_next(head);
+    } while (!threads_.compare_exchange_weak(
+        head, serial, std::memory_order_release, std::memory_order_relaxed));
+  }
+
+  CacheSerialArena(serial);
+  return serial;
+}
+
+}  // namespace internal
+
+void Arena::CallDestructorHooks() {
+  uint64 space_allocated = impl_.SpaceAllocated();
+  // Call the reset hook
+  if (on_arena_reset_ != NULL) {
+    on_arena_reset_(this, hooks_cookie_, space_allocated);
+  }
+
+  // Call the destruction hook
+  if (on_arena_destruction_ != NULL) {
+    on_arena_destruction_(this, hooks_cookie_, space_allocated);
+  }
+}
+
+void Arena::OnArenaAllocation(const std::type_info* allocated_type,
+                              size_t n) const {
+  if (on_arena_allocation_ != NULL) {
+    on_arena_allocation_(allocated_type, n, hooks_cookie_);
+  }
+}
+
+}  // namespace protobuf
+}  // namespace google