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diff --git a/gfx/skia/skia/include/private/SkSLDefines.h b/gfx/skia/skia/include/private/SkSLDefines.h
new file mode 100644
index 0000000000..a258054229
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+++ b/gfx/skia/skia/include/private/SkSLDefines.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2019 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_DEFINES
+#define SKSL_DEFINES
+
+#include <cstdint>
+
+#include "include/core/SkTypes.h"
+#include "include/private/base/SkTArray.h"
+
+using SKSL_INT = int64_t;
+using SKSL_FLOAT = float;
+
+namespace SkSL {
+
+class Expression;
+class Statement;
+
+using ComponentArray = SkSTArray<4, int8_t>; // for Swizzles
+
+class ExpressionArray : public SkSTArray<2, std::unique_ptr<Expression>> {
+public:
+    using SkSTArray::SkSTArray;
+
+    /** Returns a new ExpressionArray containing a clone of every element. */
+    ExpressionArray clone() const;
+};
+
+using StatementArray = SkSTArray<2, std::unique_ptr<Statement>>;
+
+// Functions larger than this (measured in IR nodes) will not be inlined. This growth factor
+// accounts for the number of calls being inlined--i.e., a function called five times (that is, with
+// five inlining opportunities) would be considered 5x larger than if it were called once. This
+// default threshold value is arbitrary, but tends to work well in practice.
+static constexpr int kDefaultInlineThreshold = 50;
+
+// A hard upper limit on the number of variable slots allowed in a function/global scope.
+// This is an arbitrary limit, but is needed to prevent code generation from taking unbounded
+// amounts of time or space.
+static constexpr int kVariableSlotLimit = 100000;
+
+// The SwizzleComponent namespace is used both by the SkSL::Swizzle expression, and the DSL swizzle.
+// This namespace is injected into SkSL::dsl so that `using namespace SkSL::dsl` enables DSL code
+// like `Swizzle(var, X, Y, ONE)` to compile without any extra qualifications.
+namespace SwizzleComponent {
+
+enum Type : int8_t {
+    X  =  0,  Y =  1,  Z =  2,  W =  3,
+    R  =  4,  G =  5,  B =  6,  A =  7,
+    S  =  8,  T =  9,  P = 10,  Q = 11,
+    UL = 12, UT = 13, UR = 14, UB = 15,
+    ZERO,
+    ONE
+};
+
+}  // namespace SwizzleComponent
+}  // namespace SkSL
+
+#endif