Revert of command_buffer_gles2: Implement EGL default Display as a global object

gpu/gles2_conform_support/egl/thread_state.h

-// Copyright (c) 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef GPU_GLES2_CONFORM_SUPPORT_EGL_STATE_H_
-#define GPU_GLES2_CONFORM_SUPPORT_EGL_STATE_H_
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include <EGL/egl.h>
-
-namespace egl {
-
-class Context;
-class Display;
-class Surface;
-
-// Thread-local API state of EGL.
-class ThreadState {
- public:
-  // Factory getter for the class. Should only be called by the API layer, and
-  // then passed through Display in order to avoid lock issues.
-  static ThreadState* Get();
-  static void ReleaseThread();
-
-  Surface* current_surface() const { return current_surface_.get(); }
-  Context* current_context() const { return current_context_.get(); }
-
-  template <typename T>
-  T ReturnError(EGLint error, T return_value) {
-    error_code_ = error;
-    return return_value;
-  }
-  template <typename T>
-  T ReturnSuccess(T return_value) {
-    error_code_ = EGL_SUCCESS;
-    return return_value;
-  }
-  EGLint ConsumeErrorCode();
-
-  Display* GetDefaultDisplay();
-  Display* GetDisplay(EGLDisplay);
-
-  // RAII class for ensuring that ThreadState current context
-  // is reflected in the gfx:: and gles:: global variables.
-  class AutoCurrentContextRestore {
-   public:
-    AutoCurrentContextRestore(ThreadState*);
-    ~AutoCurrentContextRestore();
-    void SetCurrent(Surface*, Context*);
-
-   private:
-    ThreadState* thread_state_;
-    DISALLOW_COPY_AND_ASSIGN(AutoCurrentContextRestore);
-  };
-
- private:
-  ThreadState();
-  ~ThreadState();
-  void SetCurrent(Surface*, Context*);
-
-  EGLint error_code_;
-  scoped_refptr<Surface> current_surface_;
-  scoped_refptr<Context> current_context_;
-  DISALLOW_COPY_AND_ASSIGN(ThreadState);
-};
-
-}  // namespace egl
-
-#endif