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

gpu/gles2_conform_support/native/egl_native_windowless.cc

Index: gpu/gles2_conform_support/native/egl_native_windowless.cc
diff --git a/gpu/gles2_conform_support/native/egl_native_windowless.cc b/gpu/gles2_conform_support/native/egl_native_windowless.cc
index a864d954fa3146c0a68f01e5d80d41d3b4cda6a5..14172cfea1e2f13451fbb5fb9673a8c06f69188c 100644
--- a/gpu/gles2_conform_support/native/egl_native_windowless.cc
+++ b/gpu/gles2_conform_support/native/egl_native_windowless.cc
@@ -1,6 +1,8 @@
 // Copyright (c) 2012 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.
+
+#include "gpu/gles2_conform_support/egl/display.h"
 
 extern "C" {
 #if defined(GLES2_CONFORM_SUPPORT_ONLY)
@@ -22,8 +24,9 @@
                               EGLDisplay eglDisplay, EGLConfig eglConfig,
                               const char* title, int width, int height,
                               EGLNativeWindowType *pNativeWindow) {
-  // GTF should use EGL pbuffer interface directly.
-  return GTFfalse;
+  egl::Display* display = static_cast<egl::Display*>(eglDisplay);
+  display->SetCreateOffscreen(width, height);
+  return GTFtrue;
 }
 
 void GTFNativeDestroyWindow(EGLNativeDisplayType nativeDisplay,