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diff --git a/gfx/angle/src/libANGLE/ImageIndex.h b/gfx/angle/src/libANGLE/ImageIndex.h
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+++ b/gfx/angle/src/libANGLE/ImageIndex.h
@@ -0,0 +1,83 @@
+//
+// Copyright 2014 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.
+//
+
+// ImageIndex.h: A helper struct for indexing into an Image array
+
+#ifndef LIBANGLE_IMAGE_INDEX_H_
+#define LIBANGLE_IMAGE_INDEX_H_
+
+#include "common/mathutil.h"
+
+#include "angle_gl.h"
+
+namespace gl
+{
+
+class ImageIndexIterator;
+
+struct ImageIndex
+{
+    GLenum type;
+    GLint mipIndex;
+    GLint layerIndex;
+
+    ImageIndex(const ImageIndex &other);
+    ImageIndex &operator=(const ImageIndex &other);
+
+    bool hasLayer() const { return layerIndex != ENTIRE_LEVEL; }
+    bool is3D() const;
+
+    static ImageIndex Make2D(GLint mipIndex);
+    static ImageIndex MakeCube(GLenum target, GLint mipIndex);
+    static ImageIndex Make2DArray(GLint mipIndex, GLint layerIndex);
+    static ImageIndex Make3D(GLint mipIndex, GLint layerIndex = ENTIRE_LEVEL);
+    static ImageIndex MakeGeneric(GLenum target, GLint mipIndex);
+
+    static ImageIndex MakeInvalid();
+
+    static const GLint ENTIRE_LEVEL = static_cast<GLint>(-1);
+
+    bool operator<(const ImageIndex &other) const;
+    bool operator==(const ImageIndex &other) const;
+    bool operator!=(const ImageIndex &other) const;
+
+  private:
+    friend class ImageIndexIterator;
+
+    ImageIndex(GLenum typeIn, GLint mipIndexIn, GLint layerIndexIn);
+};
+
+class ImageIndexIterator
+{
+  public:
+    static ImageIndexIterator Make2D(GLint minMip, GLint maxMip);
+    static ImageIndexIterator MakeCube(GLint minMip, GLint maxMip);
+    static ImageIndexIterator Make3D(GLint minMip, GLint maxMip, GLint minLayer, GLint maxLayer);
+    static ImageIndexIterator Make2DArray(GLint minMip, GLint maxMip, const GLsizei *layerCounts);
+
+    ImageIndex next();
+    ImageIndex current() const;
+    bool hasNext() const;
+
+  private:
+
+    ImageIndexIterator(GLenum type, const Range<GLint> &mipRange,
+                       const Range<GLint> &layerRange, const GLsizei *layerCounts);
+
+    GLint maxLayer() const;
+    void done();
+
+    GLenum mType;
+    Range<GLint> mMipRange;
+    Range<GLint> mLayerRange;
+    const GLsizei *mLayerCounts;
+    GLint mCurrentMip;
+    GLint mCurrentLayer;
+};
+
+}
+
+#endif // LIBANGLE_IMAGE_INDEX_H_