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diff --git a/gfx/angle/checkout/src/libANGLE/Image.h b/gfx/angle/checkout/src/libANGLE/Image.h
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+++ b/gfx/angle/checkout/src/libANGLE/Image.h
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+//
+// Copyright (c) 2015 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.
+//
+
+// Image.h: Defines the egl::Image class representing the EGLimage object.
+
+#ifndef LIBANGLE_IMAGE_H_
+#define LIBANGLE_IMAGE_H_
+
+#include "common/angleutils.h"
+#include "libANGLE/AttributeMap.h"
+#include "libANGLE/Debug.h"
+#include "libANGLE/Error.h"
+#include "libANGLE/FramebufferAttachment.h"
+#include "libANGLE/RefCountObject.h"
+#include "libANGLE/formatutils.h"
+
+#include <set>
+
+namespace rx
+{
+class EGLImplFactory;
+class ImageImpl;
+class ExternalImageSiblingImpl;
+
+// Used for distinguishing dirty bit messages from gl::Texture/rx::TexureImpl/gl::Image.
+constexpr size_t kTextureImageImplObserverMessageIndex = 0;
+constexpr size_t kTextureImageSiblingMessageIndex      = 1;
+}  // namespace rx
+
+namespace egl
+{
+class Image;
+class Display;
+
+// Only currently Renderbuffers and Textures can be bound with images. This makes the relationship
+// explicit, and also ensures that an image sibling can determine if it's been initialized or not,
+// which is important for the robust resource init extension with Textures and EGLImages.
+class ImageSibling : public gl::FramebufferAttachmentObject, public angle::ObserverInterface
+{
+  public:
+    ImageSibling();
+    ~ImageSibling() override;
+
+    bool isEGLImageTarget() const;
+    gl::InitState sourceEGLImageInitState() const;
+    void setSourceEGLImageInitState(gl::InitState initState) const;
+
+    bool isRenderable(const gl::Context *context,
+                      GLenum binding,
+                      const gl::ImageIndex &imageIndex) const override;
+
+    // ObserverInterface implementation
+    void onSubjectStateChange(angle::SubjectIndex index, angle::SubjectMessage message) override
+    {
+        // default to no-op.
+    }
+
+  protected:
+    // Set the image target of this sibling
+    void setTargetImage(const gl::Context *context, egl::Image *imageTarget);
+
+    // Orphan all EGL image sources and targets
+    angle::Result orphanImages(const gl::Context *context);
+
+    void notifySiblings(angle::SubjectMessage message);
+
+  private:
+    friend class Image;
+
+    // Called from Image only to add a new source image
+    void addImageSource(egl::Image *imageSource);
+
+    // Called from Image only to remove a source image when the Image is being deleted
+    void removeImageSource(egl::Image *imageSource);
+
+    std::set<Image *> mSourcesOf;
+    BindingPointer<Image> mTargetOf;
+};
+
+// Wrapper for EGLImage sources that are not owned by ANGLE, these often have to do
+// platform-specific queries for format and size information.
+class ExternalImageSibling : public ImageSibling
+{
+  public:
+    ExternalImageSibling(rx::EGLImplFactory *factory,
+                         const gl::Context *context,
+                         EGLenum target,
+                         EGLClientBuffer buffer,
+                         const AttributeMap &attribs);
+    ~ExternalImageSibling() override;
+
+    void onDestroy(const egl::Display *display);
+
+    Error initialize(const Display *display);
+
+    gl::Extents getAttachmentSize(const gl::ImageIndex &imageIndex) const override;
+    gl::Format getAttachmentFormat(GLenum binding, const gl::ImageIndex &imageIndex) const override;
+    GLsizei getAttachmentSamples(const gl::ImageIndex &imageIndex) const override;
+    bool isRenderable(const gl::Context *context,
+                      GLenum binding,
+                      const gl::ImageIndex &imageIndex) const override;
+    bool isTextureable(const gl::Context *context) const;
+
+    void onAttach(const gl::Context *context) override;
+    void onDetach(const gl::Context *context) override;
+    GLuint getId() const override;
+
+    gl::InitState initState(const gl::ImageIndex &imageIndex) const override;
+    void setInitState(const gl::ImageIndex &imageIndex, gl::InitState initState) override;
+
+    rx::ExternalImageSiblingImpl *getImplementation() const;
+
+  protected:
+    rx::FramebufferAttachmentObjectImpl *getAttachmentImpl() const override;
+
+  private:
+    std::unique_ptr<rx::ExternalImageSiblingImpl> mImplementation;
+};
+
+struct ImageState : private angle::NonCopyable
+{
+    ImageState(EGLenum target, ImageSibling *buffer, const AttributeMap &attribs);
+    ~ImageState();
+
+    EGLLabelKHR label;
+    EGLenum target;
+    gl::ImageIndex imageIndex;
+    ImageSibling *source;
+    std::set<ImageSibling *> targets;
+
+    gl::Format format;
+    gl::Extents size;
+    size_t samples;
+    EGLenum sourceType;
+};
+
+class Image final : public RefCountObject, public LabeledObject
+{
+  public:
+    Image(rx::EGLImplFactory *factory,
+          const gl::Context *context,
+          EGLenum target,
+          ImageSibling *buffer,
+          const AttributeMap &attribs);
+
+    void onDestroy(const Display *display) override;
+    ~Image() override;
+
+    void setLabel(EGLLabelKHR label) override;
+    EGLLabelKHR getLabel() const override;
+
+    const gl::Format &getFormat() const;
+    bool isRenderable(const gl::Context *context) const;
+    bool isTexturable(const gl::Context *context) const;
+    size_t getWidth() const;
+    size_t getHeight() const;
+    size_t getSamples() const;
+
+    Error initialize(const Display *display);
+
+    rx::ImageImpl *getImplementation() const;
+
+    bool orphaned() const;
+    gl::InitState sourceInitState() const;
+    void setInitState(gl::InitState initState);
+
+  private:
+    friend class ImageSibling;
+
+    // Called from ImageSibling only notify the image that a new target sibling exists for state
+    // tracking.
+    void addTargetSibling(ImageSibling *sibling);
+
+    // Called from ImageSibling only to notify the image that a sibling (source or target) has
+    // been respecified and state tracking should be updated.
+    angle::Result orphanSibling(const gl::Context *context, ImageSibling *sibling);
+
+    void notifySiblings(const ImageSibling *notifier, angle::SubjectMessage message);
+
+    ImageState mState;
+    rx::ImageImpl *mImplementation;
+    bool mOrphanedAndNeedsInit;
+};
+}  // namespace egl
+
+#endif  // LIBANGLE_IMAGE_H_