Add GL_EXT_multisampled_render_to_texture support to 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 152 matching lines @@
 #define GL_STENCIL_EXT                                   0x1802
 #endif
 
 // 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
+#define GL_MAX_SAMPLES_EXT                               0x8D57
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT    0x8D6C
+#endif
+
+#ifndef GL_IMG_multisampled_render_to_texture
+#define GL_RENDERBUFFER_SAMPLES_IMG                      0x9133
+#define GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_IMG        0x9134
+#define GL_MAX_SAMPLES_IMG                               0x9135
+#define GL_TEXTURE_SAMPLES_IMG                           0x9136
+#endif
 
 #define GL_GLEXT_PROTOTYPES 1
 
 #if defined(OS_WIN)
 #define GL_BINDING_CALL WINAPI
 #else
 #define GL_BINDING_CALL
 #endif
 
 #define GL_SERVICE_LOG(args) DLOG(INFO) << args;
@@ skipping 133 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_