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diff --git a/gfx/angle/checkout/src/compiler/translator/Common.h b/gfx/angle/checkout/src/compiler/translator/Common.h
new file mode 100644
index 0000000000..77907fc3a4
--- /dev/null
+++ b/gfx/angle/checkout/src/compiler/translator/Common.h
@@ -0,0 +1,256 @@
+//
+// Copyright 2002 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#ifndef COMPILER_TRANSLATOR_COMMON_H_
+#define COMPILER_TRANSLATOR_COMMON_H_
+
+#include <stdio.h>
+#include <limits>
+#include <map>
+#include <sstream>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "common/angleutils.h"
+#include "common/debug.h"
+#include "common/third_party/smhasher/src/PMurHash.h"
+#include "compiler/translator/PoolAlloc.h"
+
+namespace sh
+{
+
+struct TSourceLoc
+{
+    int first_file;
+    int first_line;
+    int last_file;
+    int last_line;
+};
+
+constexpr TSourceLoc kNoSourceLoc{-1, -1, -1, -1};
+
+//
+// Put POOL_ALLOCATOR_NEW_DELETE in base classes to make them use this scheme.
+//
+#define POOL_ALLOCATOR_NEW_DELETE                                                    \
+    void *operator new(size_t s) { return GetGlobalPoolAllocator()->allocate(s); }   \
+    void *operator new(size_t, void *_Where) { return (_Where); }                    \
+    void operator delete(void *) {}                                                  \
+    void operator delete(void *, void *) {}                                          \
+    void *operator new[](size_t s) { return GetGlobalPoolAllocator()->allocate(s); } \
+    void *operator new[](size_t, void *_Where) { return (_Where); }                  \
+    void operator delete[](void *) {}                                                \
+    void operator delete[](void *, void *) {}
+
+//
+// Pool version of string.
+//
+typedef pool_allocator<char> TStringAllocator;
+typedef std::basic_string<char, std::char_traits<char>, TStringAllocator> TString;
+typedef std::basic_ostringstream<char, std::char_traits<char>, TStringAllocator> TStringStream;
+
+//
+// Persistent memory.  Should only be used for strings that survive across compiles.
+//
+using TPersistString       = std::string;
+using TPersistStringStream = std::ostringstream;
+
+//
+// Pool allocator versions of vectors, lists, and maps
+//
+template <class T>
+class TVector : public std::vector<T, pool_allocator<T>>
+{
+  public:
+    POOL_ALLOCATOR_NEW_DELETE
+
+    typedef typename std::vector<T, pool_allocator<T>>::size_type size_type;
+    TVector() : std::vector<T, pool_allocator<T>>() {}
+    TVector(const pool_allocator<T> &a) : std::vector<T, pool_allocator<T>>(a) {}
+    TVector(size_type i) : std::vector<T, pool_allocator<T>>(i) {}
+    TVector(size_type i, const T &value) : std::vector<T, pool_allocator<T>>(i, value) {}
+    template <typename InputIt>
+    TVector(InputIt first, InputIt last) : std::vector<T, pool_allocator<T>>(first, last)
+    {}
+    TVector(std::initializer_list<T> init) : std::vector<T, pool_allocator<T>>(init) {}
+};
+
+template <class K, class D, class H = std::hash<K>, class CMP = std::equal_to<K>>
+class TUnorderedMap : public std::unordered_map<K, D, H, CMP, pool_allocator<std::pair<const K, D>>>
+{
+  public:
+    POOL_ALLOCATOR_NEW_DELETE
+    typedef pool_allocator<std::pair<const K, D>> tAllocator;
+
+    TUnorderedMap() : std::unordered_map<K, D, H, CMP, tAllocator>() {}
+    // use correct two-stage name lookup supported in gcc 3.4 and above
+    TUnorderedMap(const tAllocator &a)
+        : std::unordered_map<K, D, H, CMP, tAllocator>(
+              std::unordered_map<K, D, H, CMP, tAllocator>::key_compare(),
+              a)
+    {}
+};
+
+template <class K, class D, class CMP = std::less<K>>
+class TMap : public std::map<K, D, CMP, pool_allocator<std::pair<const K, D>>>
+{
+  public:
+    POOL_ALLOCATOR_NEW_DELETE
+    typedef pool_allocator<std::pair<const K, D>> tAllocator;
+
+    TMap() : std::map<K, D, CMP, tAllocator>() {}
+    // use correct two-stage name lookup supported in gcc 3.4 and above
+    TMap(const tAllocator &a)
+        : std::map<K, D, CMP, tAllocator>(std::map<K, D, CMP, tAllocator>::key_compare(), a)
+    {}
+};
+
+// Basic implementation of C++20's span for use with pool-allocated containers (TVector) or static
+// arrays.  This is used by the array sizes member of TType to allow arrayed types to be
+// constexpr-constructed.
+// See the reference for std::span here: https://en.cppreference.com/w/cpp/container/span
+template <typename T>
+class TSpan
+{
+  public:
+    typedef size_t size_type;
+
+    constexpr TSpan() {}
+    constexpr TSpan(T *ptr, size_type size) : mData(ptr), mSize(size) {}
+
+    constexpr TSpan(const TSpan &that) : mData(that.mData), mSize(that.mSize) {}
+    constexpr TSpan &operator=(const TSpan &that)
+    {
+        mData = that.mData;
+        mSize = that.mSize;
+        return *this;
+    }
+
+    // Note: the pointer is taken out of the TVector because TVector's memory is pool allocated,
+    // so the memory will live on even if the TVector is destroyed.
+    template <typename S>
+    TSpan(const TVector<S> &vec) : mData(vec.data()), mSize(vec.size())
+    {}
+    template <typename S>
+    TSpan &operator=(const TVector<S> &vec)
+    {
+        mData = vec.data();
+        mSize = vec.size();
+        return *this;
+    }
+
+    constexpr bool operator==(const TSpan &that) const
+    {
+        if (mSize != that.mSize)
+        {
+            return false;
+        }
+
+        if (mData == that.mData)
+        {
+            return true;
+        }
+
+        for (size_type index = 0; index < mSize; ++index)
+        {
+            if (mData[index] != that.mData[index])
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+    constexpr bool operator!=(const TSpan &that) const { return !(*this == that); }
+
+    constexpr T *data() const { return mData; }
+    constexpr size_type size() const { return mSize; }
+    constexpr bool empty() const { return mSize == 0; }
+
+    constexpr T &operator[](size_type index) const { return mData[index]; }
+    constexpr T &front() const { return mData[0]; }
+    constexpr T &back() const { return mData[mSize - 1]; }
+
+    constexpr T *begin() const { return mData; }
+    constexpr T *end() const { return mData + mSize; }
+
+    constexpr std::reverse_iterator<T *> rbegin() const
+    {
+        return std::make_reverse_iterator(end());
+    }
+    constexpr std::reverse_iterator<T *> rend() const
+    {
+        return std::make_reverse_iterator(begin());
+    }
+
+    constexpr TSpan first(size_type count) const
+    {
+        ASSERT(count <= mSize);
+        return count == 0 ? TSpan() : TSpan(mData, count);
+    }
+    constexpr TSpan last(size_type count) const
+    {
+        ASSERT(count <= mSize);
+        return count == 0 ? TSpan() : TSpan(mData + mSize - count, count);
+    }
+    constexpr TSpan subspan(size_type offset, size_type count) const
+    {
+        ASSERT(offset + count <= mSize);
+        return count == 0 ? TSpan() : TSpan(mData + offset, count);
+    }
+
+  private:
+    T *mData     = nullptr;
+    size_t mSize = 0;
+};
+
+// Integer to TString conversion
+template <typename T>
+inline TString str(T i)
+{
+    ASSERT(std::numeric_limits<T>::is_integer);
+    char buffer[((8 * sizeof(T)) / 3) + 3];
+    const char *formatStr = std::numeric_limits<T>::is_signed ? "%d" : "%u";
+    snprintf(buffer, sizeof(buffer), formatStr, i);
+    return buffer;
+}
+
+// Allocate a char array in the global memory pool. str must be a null terminated string. strLength
+// is the length without the null terminator.
+inline const char *AllocatePoolCharArray(const char *str, size_t strLength)
+{
+    size_t requiredSize = strLength + 1;
+    char *buffer        = static_cast<char *>(GetGlobalPoolAllocator()->allocate(requiredSize));
+    memcpy(buffer, str, requiredSize);
+    ASSERT(buffer[strLength] == '\0');
+    return buffer;
+}
+
+// Initialize a new stream which must be imbued with the classic locale
+template <typename T>
+T InitializeStream()
+{
+    T stream;
+    stream.imbue(std::locale::classic());
+    return stream;
+}
+
+}  // namespace sh
+
+namespace std
+{
+template <>
+struct hash<sh::TString>
+{
+    size_t operator()(const sh::TString &s) const
+    {
+        return angle::PMurHash32(0, s.data(), static_cast<int>(s.length()));
+    }
+};
+}  // namespace std
+
+#endif  // COMPILER_TRANSLATOR_COMMON_H_