Enabled EXT_sRGB WebGL extension support in the command buffer.

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 178 matching lines @@
 #define GL_PIXEL_PACK_TRANSFER_BUFFER_BINDING_CHROMIUM   0x78EE
 #define GL_PIXEL_UNPACK_TRANSFER_BUFFER_BINDING_CHROMIUM 0x78EF
 
 /* GL_EXT_discard_framebuffer */
 #ifndef GL_EXT_discard_framebuffer
 #define GL_COLOR_EXT                                     0x1800
 #define GL_DEPTH_EXT                                     0x1801
 #define GL_STENCIL_EXT                                   0x1802
 #endif
 
+// GL_EXT_sRGB
+#define GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT     0x8210
+
 // GL_ARB_get_program_binary
 #define PROGRAM_BINARY_RETRIEVABLE_HINT                  0x8257
 // GL_OES_get_program_binary
 #define GL_PROGRAM_BINARY_LENGTH_OES                     0x8741
 #define GL_NUM_PROGRAM_BINARY_FORMATS_OES                0x87FE
 #define GL_PROGRAM_BINARY_FORMATS_OES                    0x87FF
 
 #ifndef GL_EXT_multisampled_render_to_texture
 #define GL_RENDERBUFFER_SAMPLES_EXT                      0x8CAB
 #define GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT        0x8D56
@@ skipping 164 matching lines @@
 #elif defined(OS_ANDROID)
 
 GL_EXPORT extern EGLApi* g_current_egl_context;
 GL_EXPORT extern DriverEGL g_driver_egl;
 
 #endif
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_BINDINGS_H_