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diff --git a/gfx/angle/checkout/src/libANGLE/FramebufferAttachment.h b/gfx/angle/checkout/src/libANGLE/FramebufferAttachment.h
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+++ b/gfx/angle/checkout/src/libANGLE/FramebufferAttachment.h
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+//
+// Copyright (c) 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.
+//
+
+// FramebufferAttachment.h: Defines the wrapper class gl::FramebufferAttachment, as well as the
+// objects and related functionality. [OpenGL ES 2.0.24] section 4.4.3 page 108.
+
+#ifndef LIBANGLE_FRAMEBUFFERATTACHMENT_H_
+#define LIBANGLE_FRAMEBUFFERATTACHMENT_H_
+
+#include "angle_gl.h"
+#include "common/angleutils.h"
+#include "libANGLE/Error.h"
+#include "libANGLE/ImageIndex.h"
+#include "libANGLE/Observer.h"
+#include "libANGLE/formatutils.h"
+#include "libANGLE/renderer/FramebufferAttachmentObjectImpl.h"
+
+namespace egl
+{
+class Surface;
+}
+
+namespace rx
+{
+// An implementation-specific object associated with an attachment.
+
+class FramebufferAttachmentRenderTarget : angle::NonCopyable
+{
+  public:
+    FramebufferAttachmentRenderTarget() {}
+    virtual ~FramebufferAttachmentRenderTarget() {}
+};
+
+class FramebufferAttachmentObjectImpl;
+}  // namespace rx
+
+namespace gl
+{
+class FramebufferAttachmentObject;
+class Renderbuffer;
+class Texture;
+
+enum class InitState
+{
+    MayNeedInit,
+    Initialized,
+};
+
+// FramebufferAttachment implements a GL framebuffer attachment.
+// Attachments are "light" containers, which store pointers to ref-counted GL objects.
+// We support GL texture (2D/3D/Cube/2D array) and renderbuffer object attachments.
+// Note: Our old naming scheme used the term "Renderbuffer" for both GL renderbuffers and for
+// framebuffer attachments, which confused their usage.
+
+class FramebufferAttachment final
+{
+  public:
+    FramebufferAttachment();
+
+    FramebufferAttachment(const Context *context,
+                          GLenum type,
+                          GLenum binding,
+                          const ImageIndex &textureIndex,
+                          FramebufferAttachmentObject *resource);
+
+    FramebufferAttachment(FramebufferAttachment &&other);
+    FramebufferAttachment &operator=(FramebufferAttachment &&other);
+
+    ~FramebufferAttachment();
+
+    void detach(const Context *context);
+    void attach(const Context *context,
+                GLenum type,
+                GLenum binding,
+                const ImageIndex &textureIndex,
+                FramebufferAttachmentObject *resource,
+                GLsizei numViews,
+                GLuint baseViewIndex,
+                bool isMultiview);
+
+    // Helper methods
+    GLuint getRedSize() const;
+    GLuint getGreenSize() const;
+    GLuint getBlueSize() const;
+    GLuint getAlphaSize() const;
+    GLuint getDepthSize() const;
+    GLuint getStencilSize() const;
+    GLenum getComponentType() const;
+    GLenum getColorEncoding() const;
+
+    bool isTextureWithId(GLuint textureId) const
+    {
+        return mType == GL_TEXTURE && id() == textureId;
+    }
+    bool isRenderbufferWithId(GLuint renderbufferId) const
+    {
+        return mType == GL_RENDERBUFFER && id() == renderbufferId;
+    }
+
+    GLenum getBinding() const { return mTarget.binding(); }
+    GLuint id() const;
+
+    // These methods are only legal to call on Texture attachments
+    const ImageIndex &getTextureImageIndex() const;
+    TextureTarget cubeMapFace() const;
+    GLint mipLevel() const;
+    GLint layer() const;
+    bool isLayered() const;
+
+    GLsizei getNumViews() const { return mNumViews; }
+
+    bool isMultiview() const;
+    GLint getBaseViewIndex() const;
+
+    // The size of the underlying resource the attachment points to. The 'depth' value will
+    // correspond to a 3D texture depth or the layer count of a 2D array texture. For Surfaces and
+    // Renderbuffers, it will always be 1.
+    Extents getSize() const;
+    Format getFormat() const;
+    GLsizei getSamples() const;
+    GLenum type() const { return mType; }
+    bool isAttached() const { return mType != GL_NONE; }
+    bool isRenderable(const Context *context) const;
+
+    Renderbuffer *getRenderbuffer() const;
+    Texture *getTexture() const;
+    const egl::Surface *getSurface() const;
+    FramebufferAttachmentObject *getResource() const;
+    InitState initState() const;
+    angle::Result initializeContents(const Context *context);
+    void setInitState(InitState initState) const;
+
+    // "T" must be static_castable from FramebufferAttachmentRenderTarget
+    template <typename T>
+    angle::Result getRenderTarget(const Context *context, T **rtOut) const
+    {
+        static_assert(std::is_base_of<rx::FramebufferAttachmentRenderTarget, T>(),
+                      "Invalid RenderTarget class.");
+        return getRenderTargetImpl(
+            context, reinterpret_cast<rx::FramebufferAttachmentRenderTarget **>(rtOut));
+    }
+
+    bool operator==(const FramebufferAttachment &other) const;
+    bool operator!=(const FramebufferAttachment &other) const;
+
+    static const GLsizei kDefaultNumViews;
+    static const GLint kDefaultBaseViewIndex;
+
+  private:
+    angle::Result getRenderTargetImpl(const Context *context,
+                                      rx::FramebufferAttachmentRenderTarget **rtOut) const;
+
+    // A framebuffer attachment points to one of three types of resources: Renderbuffers,
+    // Textures and egl::Surface. The "Target" struct indicates which part of the
+    // object an attachment references. For the three types:
+    //   - a Renderbuffer has a unique renderable target, and needs no target index
+    //   - a Texture has targets for every image and uses an ImageIndex
+    //   - a Surface has targets for Color and Depth/Stencil, and uses the attachment binding
+    class Target
+    {
+      public:
+        Target();
+        Target(GLenum binding, const ImageIndex &imageIndex);
+        Target(const Target &other);
+        Target &operator=(const Target &other);
+
+        GLenum binding() const { return mBinding; }
+        const ImageIndex &textureIndex() const { return mTextureIndex; }
+
+      private:
+        GLenum mBinding;
+        ImageIndex mTextureIndex;
+    };
+
+    GLenum mType;
+    Target mTarget;
+    FramebufferAttachmentObject *mResource;
+    GLsizei mNumViews;
+    bool mIsMultiview;
+    GLint mBaseViewIndex;
+};
+
+// A base class for objects that FBO Attachments may point to.
+class FramebufferAttachmentObject : public angle::Subject
+{
+  public:
+    FramebufferAttachmentObject();
+    ~FramebufferAttachmentObject() override;
+
+    virtual Extents getAttachmentSize(const ImageIndex &imageIndex) const                  = 0;
+    virtual Format getAttachmentFormat(GLenum binding, const ImageIndex &imageIndex) const = 0;
+    virtual GLsizei getAttachmentSamples(const ImageIndex &imageIndex) const               = 0;
+    virtual bool isRenderable(const Context *context,
+                              GLenum binding,
+                              const ImageIndex &imageIndex) const                          = 0;
+
+    virtual void onAttach(const Context *context) = 0;
+    virtual void onDetach(const Context *context) = 0;
+    virtual GLuint getId() const                  = 0;
+
+    // These are used for robust resource initialization.
+    virtual InitState initState(const ImageIndex &imageIndex) const              = 0;
+    virtual void setInitState(const ImageIndex &imageIndex, InitState initState) = 0;
+
+    angle::Result getAttachmentRenderTarget(const Context *context,
+                                            GLenum binding,
+                                            const ImageIndex &imageIndex,
+                                            rx::FramebufferAttachmentRenderTarget **rtOut) const;
+
+    angle::Result initializeContents(const Context *context, const ImageIndex &imageIndex);
+
+  protected:
+    virtual rx::FramebufferAttachmentObjectImpl *getAttachmentImpl() const = 0;
+};
+
+inline const ImageIndex &FramebufferAttachment::getTextureImageIndex() const
+{
+    ASSERT(type() == GL_TEXTURE);
+    return mTarget.textureIndex();
+}
+
+inline Extents FramebufferAttachment::getSize() const
+{
+    ASSERT(mResource);
+    return mResource->getAttachmentSize(mTarget.textureIndex());
+}
+
+inline Format FramebufferAttachment::getFormat() const
+{
+    ASSERT(mResource);
+    return mResource->getAttachmentFormat(mTarget.binding(), mTarget.textureIndex());
+}
+
+inline GLsizei FramebufferAttachment::getSamples() const
+{
+    ASSERT(mResource);
+    return mResource->getAttachmentSamples(mTarget.textureIndex());
+}
+
+inline angle::Result FramebufferAttachment::getRenderTargetImpl(
+    const Context *context,
+    rx::FramebufferAttachmentRenderTarget **rtOut) const
+{
+    ASSERT(mResource);
+    return mResource->getAttachmentRenderTarget(context, mTarget.binding(), mTarget.textureIndex(),
+                                                rtOut);
+}
+
+inline bool FramebufferAttachment::isRenderable(const Context *context) const
+{
+    ASSERT(mResource);
+    return mResource->isRenderable(context, mTarget.binding(), mTarget.textureIndex());
+}
+
+}  // namespace gl
+
+#endif  // LIBANGLE_FRAMEBUFFERATTACHMENT_H_