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diff --git a/src/pdf/SkPDFShader.h b/src/pdf/SkPDFShader.h
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+++ b/src/pdf/SkPDFShader.h
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+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkPDFShader_DEFINED
+#define SkPDFShader_DEFINED
+
+#include "SkPDFStream.h"
+#include "SkPDFTypes.h"
+#include "SkMatrix.h"
+#include "SkRefCnt.h"
+#include "SkShader.h"
+
+class SkObjRef;
+class SkPDFCatalog;
+
+/** \class SkPDFShader
+
+    In PDF parlance, this is a pattern, used in place of a color when the
+    pattern color space is selected.
+*/
+
+class SkPDFShader {
+public:
+    /** Get the PDF shader for the passed SkShader. If the SkShader is
+     *  invalid in some way, returns NULL. The reference count of
+     *  the object is incremented and it is the caller's responsibility to
+     *  unreference it when done.  This is needed to accommodate the weak
+     *  reference pattern used when the returned object is new and has no
+     *  other references.
+     *  @param shader     The SkShader to emulate.
+     *  @param matrix     The current transform. (PDF shaders are absolutely
+     *                    positioned, relative to where the page is drawn.)
+     *  @param surfceBBox The bounding box of the drawing surface (with matrix
+     *                    already applied).
+     */
+    static SkPDFObject* GetPDFShader(const SkShader& shader,
+                                     const SkMatrix& matrix,
+                                     const SkIRect& surfaceBBox);
+
+protected:
+    class State;
+
+    class ShaderCanonicalEntry {
+    public:
+        ShaderCanonicalEntry(SkPDFObject* pdfShader, const State* state);
+        bool operator==(const ShaderCanonicalEntry& b) const;
+
+        SkPDFObject* fPDFShader;
+        const State* fState;
+    };
+    // This should be made a hash table if performance is a problem.
+    static SkTDArray<ShaderCanonicalEntry>& CanonicalShaders();
+    static SkBaseMutex& CanonicalShadersMutex();
+    static void RemoveShader(SkPDFObject* shader);
+
+    SkPDFShader();
+};
+
+#endif