Add EXT_color_buffer_half_float extension support in GPU commandbuffer service.

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 84 matching lines @@
 #define GL_RGB32F_EXT                                    0x8815
 #define GL_ALPHA32F_EXT                                  0x8816
 #define GL_LUMINANCE32F_EXT                              0x8818
 #define GL_LUMINANCE_ALPHA32F_EXT                        0x8819
 #define GL_RGBA16F_EXT                                   0x881A
 #define GL_RGB16F_EXT                                    0x881B
 #define GL_ALPHA16F_EXT                                  0x881C
 #define GL_LUMINANCE16F_EXT                              0x881E
 #define GL_LUMINANCE_ALPHA16F_EXT                        0x881F
 #define GL_BGRA8_EXT                                     0x93A1
+#define GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE_EXT     0x8211
 
 // 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
@@ skipping 213 matching lines @@
 GL_EXPORT extern DriverEGL g_driver_egl;
 
 #endif
 
 // Find an entry point to the mock GL implementation.
 void* GL_BINDING_CALL GetMockGLProcAddress(const char* name);
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_BINDINGS_H_