Update from https://crrev.com/312398

ui/gl/gl_bindings_api_autogen_osmesa.h

+// Copyright 2014 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.
+//
+// This file is auto-generated from
+// ui/gl/generate_bindings.py
+// It's formatted by clang-format using chromium coding style:
+//    clang-format -i -style=chromium filename
+// DO NOT EDIT!
+
+void OSMesaColorClampFn(GLboolean enable) override;
+OSMesaContext OSMesaCreateContextFn(GLenum format,
+                                    OSMesaContext sharelist) override;
+OSMesaContext OSMesaCreateContextExtFn(GLenum format,
+                                       GLint depthBits,
+                                       GLint stencilBits,
+                                       GLint accumBits,
+                                       OSMesaContext sharelist) override;
+void OSMesaDestroyContextFn(OSMesaContext ctx) override;
+GLboolean OSMesaGetColorBufferFn(OSMesaContext c,
+                                 GLint* width,
+                                 GLint* height,
+                                 GLint* format,
+                                 void** buffer) override;
+OSMesaContext OSMesaGetCurrentContextFn(void) override;
+GLboolean OSMesaGetDepthBufferFn(OSMesaContext c,
+                                 GLint* width,
+                                 GLint* height,
+                                 GLint* bytesPerValue,
+                                 void** buffer) override;
+void OSMesaGetIntegervFn(GLint pname, GLint* value) override;
+OSMESAproc OSMesaGetProcAddressFn(const char* funcName) override;
+GLboolean OSMesaMakeCurrentFn(OSMesaContext ctx,
+                              void* buffer,
+                              GLenum type,
+                              GLsizei width,
+                              GLsizei height) override;
+void OSMesaPixelStoreFn(GLint pname, GLint value) override;