gpu: Add ARB_occlusion_query support.

ui/gl/gl_bindings.h

 // 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.
 
 #ifndef UI_GL_GL_BINDINGS_H_
 #define UI_GL_GL_BINDINGS_H_
 
 // Includes the platform independent and platform dependent GL headers.
 // Only include this in cc files. It pulls in system headers, including
 // the X11 headers on linux, which define all kinds of macros that are
@@ skipping 99 matching lines @@
 // GL_ANGLE_instanced_arrays
 #define GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE             0x88FE
 
 // GL_EXT_occlusion_query_boolean
 #define GL_ANY_SAMPLES_PASSED_EXT                        0x8C2F
 #define GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT           0x8D6A
 #define GL_CURRENT_QUERY_EXT                             0x8865
 #define GL_QUERY_RESULT_EXT                              0x8866
 #define GL_QUERY_RESULT_AVAILABLE_EXT                    0x8867
 
+// GL_ARB_occlusion_query
+#define GL_SAMPLES_PASSED_ARB                            0x8914
+
 // GL_CHROMIUM_command_buffer_query
 #define GL_COMMANDS_ISSUED_CHROMIUM                      0x6004
 
 /* GL_CHROMIUM_get_error_query */
 #define GL_GET_ERROR_QUERY_CHROMIUM                      0x6003
 
 /* GL_CHROMIUM_command_buffer_latency_query */
 #define GL_LATENCY_QUERY_CHROMIUM                        0x6007
 
 /* GL_CHROMIUM_async_pixel_transfers */
@@ skipping 366 matching lines @@
 #endif
 
 #if defined(USE_GLX)
 GL_EXPORT extern GLXApi* g_current_glx_context;
 GL_EXPORT extern DriverGLX g_driver_glx;
 #endif
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_BINDINGS_H_