Do not allocate depth-stencil buffers for GLSurfaces.

ui/gfx/gl/gl_surface_egl.cc

 // 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.
 
 #include "ui/gfx/gl/gl_surface_egl.h"
 
 #include "build/build_config.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/angle/include/EGL/egl.h"
@@ skipping 48 matching lines @@
     return false;
   }
 
   // Choose an EGL configuration.
   static const EGLint kConfigAttribs[] = {
     EGL_BUFFER_SIZE, 32,
     EGL_ALPHA_SIZE, 8,
     EGL_BLUE_SIZE, 8,
     EGL_GREEN_SIZE, 8,
     EGL_RED_SIZE, 8,
-    EGL_DEPTH_SIZE, 16,
-    EGL_STENCIL_SIZE, 8,
     EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
     EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
     EGL_NONE
   };
 
   EGLint num_configs;
   if (!eglChooseConfig(g_display,
                        kConfigAttribs,
                        NULL,
                        0,
@@ skipping 215 matching lines @@
 
 gfx::Size PbufferGLSurfaceEGL::GetSize() {
   return size_;
 }
 
 EGLSurface PbufferGLSurfaceEGL::GetHandle() {
   return surface_;
 }
 
 }  // namespace gfx