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diff --git a/gfx/angle/checkout/src/libANGLE/Shader.h b/gfx/angle/checkout/src/libANGLE/Shader.h
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+++ b/gfx/angle/checkout/src/libANGLE/Shader.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.
+//
+
+// Shader.h: Defines the abstract gl::Shader class and its concrete derived
+// classes VertexShader and FragmentShader. Implements GL shader objects and
+// related functionality. [OpenGL ES 2.0.24] section 2.10 page 24 and section
+// 3.8 page 84.
+
+#ifndef LIBANGLE_SHADER_H_
+#define LIBANGLE_SHADER_H_
+
+#include <list>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <GLSLANG/ShaderLang.h>
+#include "angle_gl.h"
+
+#include "common/Optional.h"
+#include "common/angleutils.h"
+#include "libANGLE/Caps.h"
+#include "libANGLE/Compiler.h"
+#include "libANGLE/Debug.h"
+#include "libANGLE/angletypes.h"
+
+namespace rx
+{
+class GLImplFactory;
+class ShaderImpl;
+class ShaderSh;
+class WaitableCompileEvent;
+}  // namespace rx
+
+namespace angle
+{
+class WaitableEvent;
+class WorkerThreadPool;
+}  // namespace angle
+
+namespace gl
+{
+class CompileTask;
+class Context;
+class ShaderProgramManager;
+class State;
+
+// We defer the compile until link time, or until properties are queried.
+enum class CompileStatus
+{
+    NOT_COMPILED,
+    COMPILE_REQUESTED,
+    COMPILED,
+};
+
+class ShaderState final : angle::NonCopyable
+{
+  public:
+    ShaderState(ShaderType shaderType);
+    ~ShaderState();
+
+    const std::string &getLabel() const { return mLabel; }
+
+    const std::string &getSource() const { return mSource; }
+    bool isCompiledToBinary() const { return !mCompiledBinary.empty(); }
+    const std::string &getTranslatedSource() const { return mTranslatedSource; }
+    const sh::BinaryBlob &getCompiledBinary() const { return mCompiledBinary; }
+
+    ShaderType getShaderType() const { return mShaderType; }
+    int getShaderVersion() const { return mShaderVersion; }
+
+    const std::vector<sh::ShaderVariable> &getInputVaryings() const { return mInputVaryings; }
+    const std::vector<sh::ShaderVariable> &getOutputVaryings() const { return mOutputVaryings; }
+    const std::vector<sh::ShaderVariable> &getUniforms() const { return mUniforms; }
+    const std::vector<sh::InterfaceBlock> &getUniformBlocks() const { return mUniformBlocks; }
+    const std::vector<sh::InterfaceBlock> &getShaderStorageBlocks() const
+    {
+        return mShaderStorageBlocks;
+    }
+    const std::vector<sh::ShaderVariable> &getActiveAttributes() const { return mActiveAttributes; }
+    const std::vector<sh::ShaderVariable> &getAllAttributes() const { return mAllAttributes; }
+    const std::vector<sh::ShaderVariable> &getActiveOutputVariables() const
+    {
+        return mActiveOutputVariables;
+    }
+
+    bool compilePending() const { return mCompileStatus == CompileStatus::COMPILE_REQUESTED; }
+
+    const sh::WorkGroupSize &getLocalSize() const { return mLocalSize; }
+
+    bool getEarlyFragmentTestsOptimization() const { return mEarlyFragmentTestsOptimization; }
+    rx::SpecConstUsageBits getSpecConstUsageBits() const { return mSpecConstUsageBits; }
+
+    int getNumViews() const { return mNumViews; }
+
+    Optional<PrimitiveMode> getGeometryShaderInputPrimitiveType() const
+    {
+        return mGeometryShaderInputPrimitiveType;
+    }
+
+    Optional<PrimitiveMode> getGeometryShaderOutputPrimitiveType() const
+    {
+        return mGeometryShaderOutputPrimitiveType;
+    }
+
+    Optional<GLint> geoGeometryShaderMaxVertices() const { return mGeometryShaderMaxVertices; }
+
+    Optional<GLint> getGeometryShaderInvocations() const { return mGeometryShaderInvocations; }
+
+    CompileStatus getCompileStatus() const { return mCompileStatus; }
+
+  private:
+    friend class Shader;
+
+    std::string mLabel;
+
+    ShaderType mShaderType;
+    int mShaderVersion;
+    std::string mTranslatedSource;
+    sh::BinaryBlob mCompiledBinary;
+    std::string mSource;
+
+    sh::WorkGroupSize mLocalSize;
+
+    std::vector<sh::ShaderVariable> mInputVaryings;
+    std::vector<sh::ShaderVariable> mOutputVaryings;
+    std::vector<sh::ShaderVariable> mUniforms;
+    std::vector<sh::InterfaceBlock> mUniformBlocks;
+    std::vector<sh::InterfaceBlock> mShaderStorageBlocks;
+    std::vector<sh::ShaderVariable> mAllAttributes;
+    std::vector<sh::ShaderVariable> mActiveAttributes;
+    std::vector<sh::ShaderVariable> mActiveOutputVariables;
+
+    bool mEarlyFragmentTestsOptimization;
+    rx::SpecConstUsageBits mSpecConstUsageBits;
+
+    // ANGLE_multiview.
+    int mNumViews;
+
+    // Geometry Shader.
+    Optional<PrimitiveMode> mGeometryShaderInputPrimitiveType;
+    Optional<PrimitiveMode> mGeometryShaderOutputPrimitiveType;
+    Optional<GLint> mGeometryShaderMaxVertices;
+    int mGeometryShaderInvocations;
+
+    // Tessellation Shader
+    int mTessControlShaderVertices;
+    GLenum mTessGenMode;
+    GLenum mTessGenSpacing;
+    GLenum mTessGenVertexOrder;
+    GLenum mTessGenPointMode;
+
+    // Indicates if this shader has been successfully compiled
+    CompileStatus mCompileStatus;
+};
+
+class Shader final : angle::NonCopyable, public LabeledObject
+{
+  public:
+    Shader(ShaderProgramManager *manager,
+           rx::GLImplFactory *implFactory,
+           const gl::Limitations &rendererLimitations,
+           ShaderType type,
+           ShaderProgramID handle);
+
+    void onDestroy(const Context *context);
+
+    void setLabel(const Context *context, const std::string &label) override;
+    const std::string &getLabel() const override;
+
+    ShaderType getType() const { return mType; }
+    ShaderProgramID getHandle() const;
+
+    rx::ShaderImpl *getImplementation() const { return mImplementation.get(); }
+
+    void setSource(GLsizei count, const char *const *string, const GLint *length);
+    int getInfoLogLength();
+    void getInfoLog(GLsizei bufSize, GLsizei *length, char *infoLog);
+    std::string getInfoLogString() const { return mInfoLog; }
+    int getSourceLength() const;
+    const std::string &getSourceString() const { return mState.getSource(); }
+    void getSource(GLsizei bufSize, GLsizei *length, char *buffer) const;
+    int getTranslatedSourceLength();
+    int getTranslatedSourceWithDebugInfoLength();
+    const std::string &getTranslatedSource();
+    void getTranslatedSource(GLsizei bufSize, GLsizei *length, char *buffer);
+    void getTranslatedSourceWithDebugInfo(GLsizei bufSize, GLsizei *length, char *buffer);
+    const sh::BinaryBlob &getCompiledBinary();
+
+    void compile(const Context *context);
+    bool isCompiled();
+    bool isCompleted();
+
+    void addRef();
+    void release(const Context *context);
+    unsigned int getRefCount() const;
+    bool isFlaggedForDeletion() const;
+    void flagForDeletion();
+    bool hasEarlyFragmentTestsOptimization() const
+    {
+        return mState.mEarlyFragmentTestsOptimization;
+    }
+    rx::SpecConstUsageBits getSpecConstUsageBits() const { return mState.mSpecConstUsageBits; }
+
+    int getShaderVersion();
+
+    const std::vector<sh::ShaderVariable> &getInputVaryings();
+    const std::vector<sh::ShaderVariable> &getOutputVaryings();
+    const std::vector<sh::ShaderVariable> &getUniforms();
+    const std::vector<sh::InterfaceBlock> &getUniformBlocks();
+    const std::vector<sh::InterfaceBlock> &getShaderStorageBlocks();
+    const std::vector<sh::ShaderVariable> &getActiveAttributes();
+    const std::vector<sh::ShaderVariable> &getAllAttributes();
+    const std::vector<sh::ShaderVariable> &getActiveOutputVariables();
+
+    // Returns mapped name of a transform feedback varying. The original name may contain array
+    // brackets with an index inside, which will get copied to the mapped name. The varying must be
+    // known to be declared in the shader.
+    std::string getTransformFeedbackVaryingMappedName(const std::string &tfVaryingName);
+
+    const sh::WorkGroupSize &getWorkGroupSize();
+
+    int getNumViews();
+
+    Optional<PrimitiveMode> getGeometryShaderInputPrimitiveType();
+    Optional<PrimitiveMode> getGeometryShaderOutputPrimitiveType();
+    int getGeometryShaderInvocations();
+    Optional<GLint> getGeometryShaderMaxVertices();
+    int getTessControlShaderVertices();
+    GLenum getTessGenMode();
+    GLenum getTessGenSpacing();
+    GLenum getTessGenVertexOrder();
+    GLenum getTessGenPointMode();
+
+    const std::string &getCompilerResourcesString() const;
+
+    const ShaderState &getState() const { return mState; }
+
+    GLuint getCurrentMaxComputeWorkGroupInvocations() const
+    {
+        return mCurrentMaxComputeWorkGroupInvocations;
+    }
+
+    unsigned int getMaxComputeSharedMemory() const { return mMaxComputeSharedMemory; }
+    bool hasBeenDeleted() const { return mDeleteStatus; }
+
+  private:
+    struct CompilingState;
+
+    ~Shader() override;
+    static void GetSourceImpl(const std::string &source,
+                              GLsizei bufSize,
+                              GLsizei *length,
+                              char *buffer);
+
+    void resolveCompile();
+
+    ShaderState mState;
+    std::unique_ptr<rx::ShaderImpl> mImplementation;
+    const gl::Limitations mRendererLimitations;
+    const ShaderProgramID mHandle;
+    const ShaderType mType;
+    unsigned int mRefCount;  // Number of program objects this shader is attached to
+    bool mDeleteStatus;  // Flag to indicate that the shader can be deleted when no longer in use
+    std::string mInfoLog;
+
+    // We keep a reference to the translator in order to defer compiles while preserving settings.
+    BindingPointer<Compiler> mBoundCompiler;
+    std::unique_ptr<CompilingState> mCompilingState;
+    std::string mCompilerResourcesString;
+
+    ShaderProgramManager *mResourceManager;
+
+    GLuint mCurrentMaxComputeWorkGroupInvocations;
+    unsigned int mMaxComputeSharedMemory;
+};
+
+bool CompareShaderVar(const sh::ShaderVariable &x, const sh::ShaderVariable &y);
+
+const char *GetShaderTypeString(ShaderType type);
+}  // namespace gl
+
+#endif  // LIBANGLE_SHADER_H_