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diff --git a/gfx/angle/checkout/src/libANGLE/Display.h b/gfx/angle/checkout/src/libANGLE/Display.h
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+//
+// Copyright 2002 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.
+//
+
+// Display.h: Defines the egl::Display class, representing the abstract
+// display on which graphics are drawn. Implements EGLDisplay.
+// [EGL 1.4] section 2.1.2 page 3.
+
+#ifndef LIBANGLE_DISPLAY_H_
+#define LIBANGLE_DISPLAY_H_
+
+#include <mutex>
+#include <set>
+#include <vector>
+
+#include "libANGLE/AttributeMap.h"
+#include "libANGLE/BlobCache.h"
+#include "libANGLE/Caps.h"
+#include "libANGLE/Config.h"
+#include "libANGLE/Debug.h"
+#include "libANGLE/Error.h"
+#include "libANGLE/LoggingAnnotator.h"
+#include "libANGLE/MemoryProgramCache.h"
+#include "libANGLE/Observer.h"
+#include "libANGLE/Version.h"
+#include "platform/Feature.h"
+#include "platform/FrontendFeatures.h"
+
+namespace angle
+{
+class FrameCaptureShared;
+}  // namespace angle
+
+namespace gl
+{
+class Context;
+class TextureManager;
+class SemaphoreManager;
+}  // namespace gl
+
+namespace rx
+{
+class DisplayImpl;
+class EGLImplFactory;
+class ShareGroupImpl;
+}  // namespace rx
+
+namespace egl
+{
+class Device;
+class Image;
+class Stream;
+class Surface;
+class Sync;
+class Thread;
+
+using SurfaceSet = std::set<Surface *>;
+
+struct DisplayState final : private angle::NonCopyable
+{
+    DisplayState(EGLNativeDisplayType nativeDisplayId);
+    ~DisplayState();
+
+    EGLLabelKHR label;
+    SurfaceSet surfaceSet;
+    std::vector<std::string> featureOverridesEnabled;
+    std::vector<std::string> featureOverridesDisabled;
+    bool featuresAllDisabled;
+    EGLNativeDisplayType displayId;
+};
+
+class ShareGroup final : angle::NonCopyable
+{
+  public:
+    ShareGroup(rx::EGLImplFactory *factory);
+
+    void addRef();
+
+    void release(const egl::Display *display);
+
+    rx::ShareGroupImpl *getImplementation() const { return mImplementation; }
+
+    rx::Serial generateFramebufferSerial() { return mFramebufferSerialFactory.generate(); }
+
+    angle::FrameCaptureShared *getFrameCaptureShared() { return mFrameCaptureShared.get(); }
+
+  protected:
+    ~ShareGroup();
+
+  private:
+    size_t mRefCount;
+    rx::ShareGroupImpl *mImplementation;
+    rx::SerialFactory mFramebufferSerialFactory;
+
+    // Note: we use a raw pointer here so we can exclude frame capture sources from the build.
+    std::unique_ptr<angle::FrameCaptureShared> mFrameCaptureShared;
+};
+
+// Constant coded here as a reasonable limit.
+constexpr EGLAttrib kProgramCacheSizeAbsoluteMax = 0x4000000;
+
+class Display final : public LabeledObject,
+                      public angle::ObserverInterface,
+                      public angle::NonCopyable
+{
+  public:
+    ~Display() override;
+
+    void setLabel(EGLLabelKHR label) override;
+    EGLLabelKHR getLabel() const override;
+
+    // Observer implementation.
+    void onSubjectStateChange(angle::SubjectIndex index, angle::SubjectMessage message) override;
+
+    Error initialize();
+    Error terminate(const Thread *thread);
+    // Called before all display state dependent EGL functions. Backends can set up, for example,
+    // thread-specific backend state through this function. Not called for functions that do not
+    // need the state.
+    Error prepareForCall();
+    // Called on eglReleaseThread. Backends can tear down thread-specific backend state through
+    // this function.
+    Error releaseThread();
+
+    static Display *GetDisplayFromDevice(Device *device, const AttributeMap &attribMap);
+    static Display *GetDisplayFromNativeDisplay(EGLNativeDisplayType nativeDisplay,
+                                                const AttributeMap &attribMap);
+    static Display *GetExistingDisplayFromNativeDisplay(EGLNativeDisplayType nativeDisplay);
+
+    static const ClientExtensions &GetClientExtensions();
+    static const std::string &GetClientExtensionString();
+
+    std::vector<const Config *> getConfigs(const AttributeMap &attribs) const;
+    std::vector<const Config *> chooseConfig(const AttributeMap &attribs) const;
+
+    Error createWindowSurface(const Config *configuration,
+                              EGLNativeWindowType window,
+                              const AttributeMap &attribs,
+                              Surface **outSurface);
+    Error createPbufferSurface(const Config *configuration,
+                               const AttributeMap &attribs,
+                               Surface **outSurface);
+    Error createPbufferFromClientBuffer(const Config *configuration,
+                                        EGLenum buftype,
+                                        EGLClientBuffer clientBuffer,
+                                        const AttributeMap &attribs,
+                                        Surface **outSurface);
+    Error createPixmapSurface(const Config *configuration,
+                              NativePixmapType nativePixmap,
+                              const AttributeMap &attribs,
+                              Surface **outSurface);
+
+    Error createImage(const gl::Context *context,
+                      EGLenum target,
+                      EGLClientBuffer buffer,
+                      const AttributeMap &attribs,
+                      Image **outImage);
+
+    Error createStream(const AttributeMap &attribs, Stream **outStream);
+
+    Error createContext(const Config *configuration,
+                        gl::Context *shareContext,
+                        const EGLenum clientType,
+                        const AttributeMap &attribs,
+                        gl::Context **outContext);
+
+    Error createSync(const gl::Context *currentContext,
+                     EGLenum type,
+                     const AttributeMap &attribs,
+                     Sync **outSync);
+
+    Error makeCurrent(gl::Context *previousContext,
+                      Surface *drawSurface,
+                      Surface *readSurface,
+                      gl::Context *context);
+
+    Error destroySurface(Surface *surface);
+    void destroyImage(Image *image);
+    void destroyStream(Stream *stream);
+    Error destroyContext(const Thread *thread, gl::Context *context);
+    Error destroyContextWithSurfaces(const Thread *thread,
+                                     gl::Context *context,
+                                     gl::Context *currentContext,
+                                     Surface *currentDrawSurface,
+                                     Surface *currentReadSurface);
+    void destroySync(Sync *sync);
+
+    bool isInitialized() const;
+    bool isValidConfig(const Config *config) const;
+    bool isValidContext(const gl::Context *context) const;
+    bool isValidSurface(const Surface *surface) const;
+    bool isValidImage(const Image *image) const;
+    bool isValidStream(const Stream *stream) const;
+    bool isValidSync(const Sync *sync) const;
+    bool isValidNativeWindow(EGLNativeWindowType window) const;
+
+    Error validateClientBuffer(const Config *configuration,
+                               EGLenum buftype,
+                               EGLClientBuffer clientBuffer,
+                               const AttributeMap &attribs) const;
+    Error validateImageClientBuffer(const gl::Context *context,
+                                    EGLenum target,
+                                    EGLClientBuffer clientBuffer,
+                                    const egl::AttributeMap &attribs) const;
+    Error valdiatePixmap(const Config *config,
+                         EGLNativePixmapType pixmap,
+                         const AttributeMap &attributes) const;
+
+    static bool isValidDisplay(const Display *display);
+    static bool isValidNativeDisplay(EGLNativeDisplayType display);
+    static bool hasExistingWindowSurface(EGLNativeWindowType window);
+
+    bool isDeviceLost() const;
+    bool testDeviceLost();
+    void notifyDeviceLost();
+
+    void setBlobCacheFuncs(EGLSetBlobFuncANDROID set, EGLGetBlobFuncANDROID get);
+    bool areBlobCacheFuncsSet() const { return mBlobCache.areBlobCacheFuncsSet(); }
+    BlobCache &getBlobCache() { return mBlobCache; }
+
+    static EGLClientBuffer GetNativeClientBuffer(const struct AHardwareBuffer *buffer);
+    static Error CreateNativeClientBuffer(const egl::AttributeMap &attribMap,
+                                          EGLClientBuffer *eglClientBuffer);
+
+    Error waitClient(const gl::Context *context);
+    Error waitNative(const gl::Context *context, EGLint engine);
+
+    const Caps &getCaps() const;
+
+    const DisplayExtensions &getExtensions() const;
+    const std::string &getExtensionString() const;
+    const std::string &getVendorString() const;
+    const std::string &getVersionString() const;
+
+    std::string getBackendRendererDescription() const;
+    std::string getBackendVendorString() const;
+    std::string getBackendVersionString() const;
+
+    EGLint programCacheGetAttrib(EGLenum attrib) const;
+    Error programCacheQuery(EGLint index,
+                            void *key,
+                            EGLint *keysize,
+                            void *binary,
+                            EGLint *binarysize);
+    Error programCachePopulate(const void *key,
+                               EGLint keysize,
+                               const void *binary,
+                               EGLint binarysize);
+    EGLint programCacheResize(EGLint limit, EGLenum mode);
+
+    const AttributeMap &getAttributeMap() const { return mAttributeMap; }
+    EGLNativeDisplayType getNativeDisplayId() const { return mState.displayId; }
+
+    rx::DisplayImpl *getImplementation() const { return mImplementation; }
+    Device *getDevice() const;
+    Surface *getWGLSurface() const;
+    EGLenum getPlatform() const { return mPlatform; }
+
+    gl::Version getMaxSupportedESVersion() const;
+
+    const DisplayState &getState() const { return mState; }
+
+    typedef std::set<gl::Context *> ContextSet;
+    const ContextSet &getContextSet() { return mContextSet; }
+
+    const angle::FrontendFeatures &getFrontendFeatures() { return mFrontendFeatures; }
+    void overrideFrontendFeatures(const std::vector<std::string> &featureNames, bool enabled);
+
+    const angle::FeatureList &getFeatures() const { return mFeatures; }
+
+    const char *queryStringi(const EGLint name, const EGLint index);
+
+    EGLAttrib queryAttrib(const EGLint attribute);
+
+    angle::ScratchBuffer requestScratchBuffer();
+    void returnScratchBuffer(angle::ScratchBuffer scratchBuffer);
+
+    angle::ScratchBuffer requestZeroFilledBuffer();
+    void returnZeroFilledBuffer(angle::ScratchBuffer zeroFilledBuffer);
+
+    egl::Error handleGPUSwitch();
+
+    std::mutex &getDisplayGlobalMutex() { return mDisplayGlobalMutex; }
+    std::mutex &getProgramCacheMutex() { return mProgramCacheMutex; }
+
+    // Installs LoggingAnnotator as the global DebugAnnotator, for back-ends that do not implement
+    // their own DebugAnnotator.
+    void setGlobalDebugAnnotator() { gl::InitializeDebugAnnotations(&mAnnotator); }
+
+  private:
+    Display(EGLenum platform, EGLNativeDisplayType displayId, Device *eglDevice);
+
+    void setAttributes(const AttributeMap &attribMap) { mAttributeMap = attribMap; }
+
+    void setupDisplayPlatform(rx::DisplayImpl *impl);
+
+    void updateAttribsFromEnvironment(const AttributeMap &attribMap);
+
+    Error restoreLostDevice();
+    Error releaseContext(gl::Context *context);
+
+    void initDisplayExtensions();
+    void initVendorString();
+    void initVersionString();
+    void initializeFrontendFeatures();
+
+    angle::ScratchBuffer requestScratchBufferImpl(std::vector<angle::ScratchBuffer> *bufferVector);
+    void returnScratchBufferImpl(angle::ScratchBuffer scratchBuffer,
+                                 std::vector<angle::ScratchBuffer> *bufferVector);
+
+    DisplayState mState;
+    rx::DisplayImpl *mImplementation;
+    angle::ObserverBinding mGPUSwitchedBinding;
+
+    AttributeMap mAttributeMap;
+
+    ConfigSet mConfigSet;
+
+    ContextSet mContextSet;
+
+    typedef std::set<Image *> ImageSet;
+    ImageSet mImageSet;
+
+    typedef std::set<Stream *> StreamSet;
+    StreamSet mStreamSet;
+
+    typedef std::set<Sync *> SyncSet;
+    SyncSet mSyncSet;
+
+    bool mInitialized;
+    bool mDeviceLost;
+
+    Caps mCaps;
+
+    DisplayExtensions mDisplayExtensions;
+    std::string mDisplayExtensionString;
+
+    std::string mVendorString;
+    std::string mVersionString;
+
+    Device *mDevice;
+    Surface *mSurface;
+    EGLenum mPlatform;
+    angle::LoggingAnnotator mAnnotator;
+
+    gl::TextureManager *mTextureManager;
+    gl::SemaphoreManager *mSemaphoreManager;
+    BlobCache mBlobCache;
+    gl::MemoryProgramCache mMemoryProgramCache;
+    size_t mGlobalTextureShareGroupUsers;
+    size_t mGlobalSemaphoreShareGroupUsers;
+
+    angle::FrontendFeatures mFrontendFeatures;
+
+    angle::FeatureList mFeatures;
+
+    std::mutex mScratchBufferMutex;
+    std::vector<angle::ScratchBuffer> mScratchBuffers;
+    std::vector<angle::ScratchBuffer> mZeroFilledBuffers;
+
+    std::mutex mDisplayGlobalMutex;
+    std::mutex mProgramCacheMutex;
+};
+
+}  // namespace egl
+
+#endif  // LIBANGLE_DISPLAY_H_