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diff --git a/gfx/angle/checkout/src/libANGLE/FramebufferAttachment.cpp b/gfx/angle/checkout/src/libANGLE/FramebufferAttachment.cpp
new file mode 100644
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--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/FramebufferAttachment.cpp
@@ -0,0 +1,317 @@
+//
+// 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.cpp: the gl::FramebufferAttachment class and its derived classes
+// objects and related functionality. [OpenGL ES 2.0.24] section 4.4.3 page 108.
+
+#include "libANGLE/FramebufferAttachment.h"
+
+#include "common/utilities.h"
+#include "libANGLE/Config.h"
+#include "libANGLE/Context.h"
+#include "libANGLE/Renderbuffer.h"
+#include "libANGLE/Surface.h"
+#include "libANGLE/Texture.h"
+#include "libANGLE/formatutils.h"
+#include "libANGLE/renderer/FramebufferAttachmentObjectImpl.h"
+#include "libANGLE/renderer/FramebufferImpl.h"
+
+namespace gl
+{
+
+////// FramebufferAttachment::Target Implementation //////
+
+const GLsizei FramebufferAttachment::kDefaultNumViews    = 1;
+const GLint FramebufferAttachment::kDefaultBaseViewIndex = 0;
+
+FramebufferAttachment::Target::Target() : mBinding(GL_NONE), mTextureIndex() {}
+
+FramebufferAttachment::Target::Target(GLenum binding, const ImageIndex &imageIndex)
+    : mBinding(binding), mTextureIndex(imageIndex)
+{}
+
+FramebufferAttachment::Target::Target(const Target &other)
+    : mBinding(other.mBinding), mTextureIndex(other.mTextureIndex)
+{}
+
+FramebufferAttachment::Target &FramebufferAttachment::Target::operator=(const Target &other)
+{
+    this->mBinding      = other.mBinding;
+    this->mTextureIndex = other.mTextureIndex;
+    return *this;
+}
+
+////// FramebufferAttachment Implementation //////
+
+FramebufferAttachment::FramebufferAttachment()
+    : mType(GL_NONE),
+      mResource(nullptr),
+      mNumViews(kDefaultNumViews),
+      mIsMultiview(false),
+      mBaseViewIndex(kDefaultBaseViewIndex)
+{}
+
+FramebufferAttachment::FramebufferAttachment(const Context *context,
+                                             GLenum type,
+                                             GLenum binding,
+                                             const ImageIndex &textureIndex,
+                                             FramebufferAttachmentObject *resource)
+    : mResource(nullptr)
+{
+    attach(context, type, binding, textureIndex, resource, kDefaultNumViews, kDefaultBaseViewIndex,
+           false);
+}
+
+FramebufferAttachment::FramebufferAttachment(FramebufferAttachment &&other)
+    : FramebufferAttachment()
+{
+    *this = std::move(other);
+}
+
+FramebufferAttachment &FramebufferAttachment::operator=(FramebufferAttachment &&other)
+{
+    std::swap(mType, other.mType);
+    std::swap(mTarget, other.mTarget);
+    std::swap(mResource, other.mResource);
+    std::swap(mNumViews, other.mNumViews);
+    std::swap(mIsMultiview, other.mIsMultiview);
+    std::swap(mBaseViewIndex, other.mBaseViewIndex);
+    return *this;
+}
+
+FramebufferAttachment::~FramebufferAttachment()
+{
+    ASSERT(!isAttached());
+}
+
+void FramebufferAttachment::detach(const Context *context)
+{
+    mType = GL_NONE;
+    if (mResource != nullptr)
+    {
+        mResource->onDetach(context);
+        mResource = nullptr;
+    }
+    mNumViews      = kDefaultNumViews;
+    mIsMultiview   = false;
+    mBaseViewIndex = kDefaultBaseViewIndex;
+
+    // not technically necessary, could omit for performance
+    mTarget = Target();
+}
+
+void FramebufferAttachment::attach(const Context *context,
+                                   GLenum type,
+                                   GLenum binding,
+                                   const ImageIndex &textureIndex,
+                                   FramebufferAttachmentObject *resource,
+                                   GLsizei numViews,
+                                   GLuint baseViewIndex,
+                                   bool isMultiview)
+{
+    if (resource == nullptr)
+    {
+        detach(context);
+        return;
+    }
+
+    mType          = type;
+    mTarget        = Target(binding, textureIndex);
+    mNumViews      = numViews;
+    mBaseViewIndex = baseViewIndex;
+    mIsMultiview   = isMultiview;
+    resource->onAttach(context);
+
+    if (mResource != nullptr)
+    {
+        mResource->onDetach(context);
+    }
+
+    mResource = resource;
+}
+
+GLuint FramebufferAttachment::getRedSize() const
+{
+    return getFormat().info->redBits;
+}
+
+GLuint FramebufferAttachment::getGreenSize() const
+{
+    return getFormat().info->greenBits;
+}
+
+GLuint FramebufferAttachment::getBlueSize() const
+{
+    return getFormat().info->blueBits;
+}
+
+GLuint FramebufferAttachment::getAlphaSize() const
+{
+    return getFormat().info->alphaBits;
+}
+
+GLuint FramebufferAttachment::getDepthSize() const
+{
+    return getFormat().info->depthBits;
+}
+
+GLuint FramebufferAttachment::getStencilSize() const
+{
+    return getFormat().info->stencilBits;
+}
+
+GLenum FramebufferAttachment::getComponentType() const
+{
+    return getFormat().info->componentType;
+}
+
+GLenum FramebufferAttachment::getColorEncoding() const
+{
+    return getFormat().info->colorEncoding;
+}
+
+GLuint FramebufferAttachment::id() const
+{
+    return mResource->getId();
+}
+
+TextureTarget FramebufferAttachment::cubeMapFace() const
+{
+    ASSERT(mType == GL_TEXTURE);
+
+    const auto &index = mTarget.textureIndex();
+    return index.getType() == TextureType::CubeMap ? index.getTarget() : TextureTarget::InvalidEnum;
+}
+
+GLint FramebufferAttachment::mipLevel() const
+{
+    ASSERT(type() == GL_TEXTURE);
+    return mTarget.textureIndex().getLevelIndex();
+}
+
+GLint FramebufferAttachment::layer() const
+{
+    ASSERT(mType == GL_TEXTURE);
+
+    const gl::ImageIndex &index = mTarget.textureIndex();
+    return (index.has3DLayer() ? index.getLayerIndex() : 0);
+}
+
+bool FramebufferAttachment::isLayered() const
+{
+    return mTarget.textureIndex().isLayered();
+}
+
+bool FramebufferAttachment::isMultiview() const
+{
+    return mIsMultiview;
+}
+
+GLint FramebufferAttachment::getBaseViewIndex() const
+{
+    return mBaseViewIndex;
+}
+
+Texture *FramebufferAttachment::getTexture() const
+{
+    return rx::GetAs<Texture>(mResource);
+}
+
+Renderbuffer *FramebufferAttachment::getRenderbuffer() const
+{
+    return rx::GetAs<Renderbuffer>(mResource);
+}
+
+const egl::Surface *FramebufferAttachment::getSurface() const
+{
+    return rx::GetAs<egl::Surface>(mResource);
+}
+
+FramebufferAttachmentObject *FramebufferAttachment::getResource() const
+{
+    return mResource;
+}
+
+bool FramebufferAttachment::operator==(const FramebufferAttachment &other) const
+{
+    if (mResource != other.mResource || mType != other.mType || mNumViews != other.mNumViews ||
+        mIsMultiview != other.mIsMultiview || mBaseViewIndex != other.mBaseViewIndex)
+    {
+        return false;
+    }
+
+    if (mType == GL_TEXTURE && getTextureImageIndex() != other.getTextureImageIndex())
+    {
+        return false;
+    }
+
+    return true;
+}
+
+bool FramebufferAttachment::operator!=(const FramebufferAttachment &other) const
+{
+    return !(*this == other);
+}
+
+InitState FramebufferAttachment::initState() const
+{
+    return mResource ? mResource->initState(mTarget.textureIndex()) : InitState::Initialized;
+}
+
+angle::Result FramebufferAttachment::initializeContents(const Context *context)
+{
+    ASSERT(mResource);
+    ANGLE_TRY(mResource->initializeContents(context, mTarget.textureIndex()));
+    setInitState(InitState::Initialized);
+    return angle::Result::Continue;
+}
+
+void FramebufferAttachment::setInitState(InitState initState) const
+{
+    ASSERT(mResource);
+    mResource->setInitState(mTarget.textureIndex(), initState);
+}
+
+////// FramebufferAttachmentObject Implementation //////
+
+FramebufferAttachmentObject::FramebufferAttachmentObject() {}
+
+FramebufferAttachmentObject::~FramebufferAttachmentObject() {}
+
+angle::Result FramebufferAttachmentObject::getAttachmentRenderTarget(
+    const Context *context,
+    GLenum binding,
+    const ImageIndex &imageIndex,
+    rx::FramebufferAttachmentRenderTarget **rtOut) const
+{
+    return getAttachmentImpl()->getAttachmentRenderTarget(context, binding, imageIndex, rtOut);
+}
+
+angle::Result FramebufferAttachmentObject::initializeContents(const Context *context,
+                                                              const ImageIndex &imageIndex)
+{
+    ASSERT(context->isRobustResourceInitEnabled());
+
+    // Because gl::Texture cannot support tracking individual layer dirtiness, we only handle
+    // initializing entire mip levels for 2D array textures.
+    if (imageIndex.getType() == TextureType::_2DArray && imageIndex.hasLayer())
+    {
+        ImageIndex fullMipIndex =
+            ImageIndex::Make2DArray(imageIndex.getLevelIndex(), ImageIndex::kEntireLevel);
+        return getAttachmentImpl()->initializeContents(context, fullMipIndex);
+    }
+    else if (imageIndex.getType() == TextureType::_2DMultisampleArray && imageIndex.hasLayer())
+    {
+        ImageIndex fullMipIndex = ImageIndex::Make2DMultisampleArray(ImageIndex::kEntireLevel);
+        return getAttachmentImpl()->initializeContents(context, fullMipIndex);
+    }
+    else
+    {
+        return getAttachmentImpl()->initializeContents(context, imageIndex);
+    }
+}
+
+}  // namespace gl