command_buffer_gles2: Implement EGL default Display as a global object

gpu/gles2_conform_support/egl/config.h

 // Copyright (c) 2011 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_TEST_CONFIG_H_
 #define GPU_GLES2_CONFORM_TEST_CONFIG_H_
 
 #include <EGL/egl.h>
 
 #include "base/macros.h"
 
 namespace egl {
 
 class Config {
  public:
-  Config();
+  explicit Config(EGLint surface_type);
   ~Config();
-
+  bool Matches(const EGLint* attrib_list) const;
   bool GetAttrib(EGLint attribute, EGLint* value) const;
+  static bool ValidateAttributeList(const EGLint* attrib_list);
 
  private:
   // Total color component bits in the color buffer.
   EGLint buffer_size_;
   // Bits of Red in the color buffer.
   EGLint red_size_;
   // Bits of Green in the color buffer.
   EGLint green_size_;
   // Bits of Blue in the color buffer.
   EGLint blue_size_;
@@ skipping 53 matching lines @@
   EGLint transparent_green_value_;
   // Transparent blue value
   EGLint transparent_blue_value_;
 
   DISALLOW_COPY_AND_ASSIGN(Config);
 };
 
 }  // namespace egl
 
 #endif  // GPU_GLES2_CONFORM_TEST_CONFIG_H_