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diff --git a/gfx/angle/checkout/src/libANGLE/Buffer.h b/gfx/angle/checkout/src/libANGLE/Buffer.h
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+++ b/gfx/angle/checkout/src/libANGLE/Buffer.h
@@ -0,0 +1,155 @@
+//
+// Copyright (c) 2002-2014 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.
+//
+
+// Buffer.h: Defines the gl::Buffer class, representing storage of vertex and/or
+// index data. Implements GL buffer objects and related functionality.
+// [OpenGL ES 2.0.24] section 2.9 page 21.
+
+#ifndef LIBANGLE_BUFFER_H_
+#define LIBANGLE_BUFFER_H_
+
+#include "common/PackedEnums.h"
+#include "common/angleutils.h"
+#include "libANGLE/Debug.h"
+#include "libANGLE/Error.h"
+#include "libANGLE/IndexRangeCache.h"
+#include "libANGLE/Observer.h"
+#include "libANGLE/RefCountObject.h"
+
+namespace rx
+{
+class BufferImpl;
+class GLImplFactory;
+}  // namespace rx
+
+namespace gl
+{
+class Buffer;
+class Context;
+
+class BufferState final : angle::NonCopyable
+{
+  public:
+    BufferState();
+    ~BufferState();
+
+    BufferUsage getUsage() const { return mUsage; }
+    GLbitfield getAccessFlags() const { return mAccessFlags; }
+    GLenum getAccess() const { return mAccess; }
+    GLboolean isMapped() const { return mMapped; }
+    void *getMapPointer() const { return mMapPointer; }
+    GLint64 getMapOffset() const { return mMapOffset; }
+    GLint64 getMapLength() const { return mMapLength; }
+    GLint64 getSize() const { return mSize; }
+    bool isBoundForTransformFeedback() const { return mTransformFeedbackIndexedBindingCount != 0; }
+
+  private:
+    friend class Buffer;
+
+    std::string mLabel;
+
+    BufferUsage mUsage;
+    GLint64 mSize;
+    GLbitfield mAccessFlags;
+    GLenum mAccess;
+    GLboolean mMapped;
+    void *mMapPointer;
+    GLint64 mMapOffset;
+    GLint64 mMapLength;
+    int mBindingCount;
+    int mTransformFeedbackIndexedBindingCount;
+    int mTransformFeedbackGenericBindingCount;
+};
+
+class Buffer final : public RefCountObject,
+                     public LabeledObject,
+                     public angle::ObserverInterface,
+                     public angle::Subject
+{
+  public:
+    Buffer(rx::GLImplFactory *factory, GLuint id);
+    ~Buffer() override;
+    void onDestroy(const Context *context) override;
+
+    void setLabel(const Context *context, const std::string &label) override;
+    const std::string &getLabel() const override;
+
+    angle::Result bufferData(Context *context,
+                             BufferBinding target,
+                             const void *data,
+                             GLsizeiptr size,
+                             BufferUsage usage);
+    angle::Result bufferSubData(const Context *context,
+                                BufferBinding target,
+                                const void *data,
+                                GLsizeiptr size,
+                                GLintptr offset);
+    angle::Result copyBufferSubData(const Context *context,
+                                    Buffer *source,
+                                    GLintptr sourceOffset,
+                                    GLintptr destOffset,
+                                    GLsizeiptr size);
+    angle::Result map(const Context *context, GLenum access);
+    angle::Result mapRange(const Context *context,
+                           GLintptr offset,
+                           GLsizeiptr length,
+                           GLbitfield access);
+    angle::Result unmap(const Context *context, GLboolean *result);
+
+    // These are called when another operation changes Buffer data.
+    void onTransformFeedback();
+    void onPixelPack();
+
+    angle::Result getIndexRange(const gl::Context *context,
+                                DrawElementsType type,
+                                size_t offset,
+                                size_t count,
+                                bool primitiveRestartEnabled,
+                                IndexRange *outRange) const;
+
+    BufferUsage getUsage() const { return mState.mUsage; }
+    GLbitfield getAccessFlags() const { return mState.mAccessFlags; }
+    GLenum getAccess() const { return mState.mAccess; }
+    GLboolean isMapped() const { return mState.mMapped; }
+    void *getMapPointer() const { return mState.mMapPointer; }
+    GLint64 getMapOffset() const { return mState.mMapOffset; }
+    GLint64 getMapLength() const { return mState.mMapLength; }
+    GLint64 getSize() const { return mState.mSize; }
+    GLint64 getMemorySize() const;
+
+    rx::BufferImpl *getImplementation() const { return mImpl; }
+
+    ANGLE_INLINE bool isBound() const { return mState.mBindingCount > 0; }
+
+    ANGLE_INLINE bool isBoundForTransformFeedbackAndOtherUse() const
+    {
+        // The transform feedback generic binding point is not an indexed binding point but it also
+        // does not count as a non-transform-feedback use of the buffer, so we subtract it from the
+        // binding count when checking if the buffer is bound to a non-transform-feedback location.
+        // See https://crbug.com/853978
+        return mState.mTransformFeedbackIndexedBindingCount > 0 &&
+               mState.mTransformFeedbackIndexedBindingCount !=
+                   mState.mBindingCount - mState.mTransformFeedbackGenericBindingCount;
+    }
+
+    bool isDoubleBoundForTransformFeedback() const;
+    void onTFBindingChanged(const Context *context, bool bound, bool indexed);
+    void onNonTFBindingChanged(int incr) { mState.mBindingCount += incr; }
+
+    // angle::ObserverInterface implementation.
+    void onSubjectStateChange(angle::SubjectIndex index, angle::SubjectMessage message) override;
+
+  private:
+    BufferState mState;
+    rx::BufferImpl *mImpl;
+    angle::ObserverBinding mImplObserver;
+
+    mutable IndexRangeCache mIndexRangeCache;
+};
+
+}  // namespace gl
+
+#endif  // LIBANGLE_BUFFER_H_