Hook ANGLE_request_extension up to the passthrough cmd decoder.

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 92 matching lines @@
 #define GL_ALPHA16F_EXT                                  0x881C
 #define GL_LUMINANCE16F_EXT                              0x881E
 #define GL_LUMINANCE_ALPHA16F_EXT                        0x881F
 #define GL_R32F_EXT 0x822E
 #define GL_RG32F_EXT 0x8230
 #define GL_BGRA8_EXT                                     0x93A1
 
 // GL_ANGLE_instanced_arrays
 #define GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE             0x88FE
 
+// GL_ANGLE_request_extension
+#define GL_REQUESTABLE_EXTENSIONS_ANGLE 0x93A8
+#define GL_NUM_REQUESTABLE_EXTENSIONS_ANGLE 0x93A8
+
 // 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
 
@@ skipping 367 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_