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diff --git a/gfx/angle/checkout/src/libANGLE/Stream.h b/gfx/angle/checkout/src/libANGLE/Stream.h
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+++ b/gfx/angle/checkout/src/libANGLE/Stream.h
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+//
+// Copyright 2016 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.
+//
+
+// Stream.h: Defines the egl::Stream class, representing the stream
+// where frames are streamed in. Implements EGLStreanKHR.
+
+#ifndef LIBANGLE_STREAM_H_
+#define LIBANGLE_STREAM_H_
+
+#include <array>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include "common/angleutils.h"
+#include "libANGLE/AttributeMap.h"
+#include "libANGLE/Debug.h"
+
+namespace rx
+{
+class StreamProducerImpl;
+}
+
+namespace gl
+{
+class Context;
+class Texture;
+}  // namespace gl
+
+namespace egl
+{
+class Display;
+class Error;
+class Thread;
+
+class Stream final : public LabeledObject, angle::NonCopyable
+{
+  public:
+    Stream(Display *display, const AttributeMap &attribs);
+    ~Stream() override;
+
+    void setLabel(EGLLabelKHR label) override;
+    EGLLabelKHR getLabel() const override;
+
+    enum class ConsumerType
+    {
+        NoConsumer,
+        GLTextureRGB,
+        GLTextureYUV,
+    };
+
+    enum class ProducerType
+    {
+        NoProducer,
+        D3D11Texture,
+    };
+
+    // A GL texture interpretation of a part of a producer frame. For use with GL texture consumers
+    struct GLTextureDescription
+    {
+        unsigned int width;
+        unsigned int height;
+        unsigned int internalFormat;
+        unsigned int mipLevels;
+    };
+
+    EGLenum getState() const;
+
+    void setConsumerLatency(EGLint latency);
+    EGLint getConsumerLatency() const;
+
+    EGLuint64KHR getProducerFrame() const;
+    EGLuint64KHR getConsumerFrame() const;
+
+    void setConsumerAcquireTimeout(EGLint timeout);
+    EGLint getConsumerAcquireTimeout() const;
+
+    ConsumerType getConsumerType() const;
+    ProducerType getProducerType() const;
+
+    EGLint getPlaneCount() const;
+
+    rx::StreamProducerImpl *getImplementation();
+
+    // Consumer creation methods
+    Error createConsumerGLTextureExternal(const AttributeMap &attributes, gl::Context *context);
+
+    // Producer creation methods
+    Error createProducerD3D11Texture(const AttributeMap &attributes);
+
+    // Consumer methods
+    Error consumerAcquire(const gl::Context *context);
+    Error consumerRelease(const gl::Context *context);
+
+    // Some consumers are bound to GL contexts. This validates that a given context is bound to the
+    // stream's consumer
+    bool isConsumerBoundToContext(const gl::Context *context) const;
+
+    // Producer methods
+    Error validateD3D11Texture(const void *texture, const AttributeMap &attributes) const;
+    Error postD3D11Texture(void *texture, const AttributeMap &attributes);
+
+  private:
+    EGLLabelKHR mLabel;
+
+    // Associated display
+    Display *mDisplay;
+
+    // Producer Implementation
+    rx::StreamProducerImpl *mProducerImplementation;
+
+    // Associated GL context. Note that this is a weak pointer used for validation purposes only,
+    // and should never be arbitrarily dereferenced without knowing the context still exists as it
+    // can become dangling at any time.
+    gl::Context *mContext;
+
+    // EGL defined attributes
+    EGLint mState;
+    EGLuint64KHR mProducerFrame;
+    EGLuint64KHR mConsumerFrame;
+    EGLint mConsumerLatency;
+
+    // EGL gltexture consumer attributes
+    EGLint mConsumerAcquireTimeout;
+
+    // EGL gltexture yuv consumer attributes
+    EGLint mPlaneCount;
+    struct PlaneTexture
+    {
+        EGLint textureUnit;
+        gl::Texture *texture;
+    };
+    // Texture units and textures for all the planes
+    std::array<PlaneTexture, 3> mPlanes;
+
+    // Consumer and producer types
+    ConsumerType mConsumerType;
+    ProducerType mProducerType;
+
+    // ANGLE-only method, used internally
+    friend class gl::Texture;
+    void releaseTextures();
+};
+}  // namespace egl
+
+#endif  // LIBANGLE_STREAM_H_