Update from https://crrev.com/316786

ui/gl/gl_bindings_skia_in_process.cc

 // 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.
 
 
 #include "ui/gl/gl_bindings_skia_in_process.h"
 
 #include "base/logging.h"
 #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
 #include "ui/gl/gl_bindings.h"
@@ skipping 259 matching lines @@
 }
 
 GLvoid StubGLGenTextures(GLsizei n, GLuint* textures) {
   glGenTextures(n, textures);
 }
 
 GLvoid StubGLGenVertexArrays(GLsizei n, GLuint* arrays) {
   glGenVertexArraysOES(n, arrays);
 }
 
+GLvoid StubGLGenerateMipmap(GLenum target){
+  glGenerateMipmapEXT(target);
+}
+
 GLvoid StubGLGetBufferParameteriv(GLenum target, GLenum pname, GLint* params) {
   glGetBufferParameteriv(target, pname, params);
 }
 
 GLvoid StubGLGetFramebufferAttachmentParameteriv(GLenum target,
                                                  GLenum attachment,
                                                  GLenum pname, GLint* params) {
   glGetFramebufferAttachmentParameterivEXT(target, attachment, pname, params);
 }
 
@@ skipping 371 matching lines @@
   functions->fEnable = StubGLEnable;
   functions->fEnableVertexAttribArray = StubGLEnableVertexAttribArray;
   functions->fEndQuery = StubGLEndQuery;
   functions->fFinish = StubGLFinish;
   functions->fFlush = StubGLFlush;
   functions->fFrontFace = StubGLFrontFace;
   functions->fGenBuffers = StubGLGenBuffers;
   functions->fGenQueries = StubGLGenQueries;
   functions->fGenTextures = StubGLGenTextures;
   functions->fGenVertexArrays = StubGLGenVertexArrays;
+  functions->fGenerateMipmap = StubGLGenerateMipmap;
   functions->fGetBufferParameteriv = StubGLGetBufferParameteriv;
   functions->fGetError = StubGLGetError;
   functions->fGetIntegerv = StubGLGetIntegerv;
   functions->fGetQueryiv = StubGLGetQueryiv;
   functions->fGetQueryObjecti64v = StubGLGetQueryObjecti64v;
   functions->fGetQueryObjectiv = StubGLGetQueryObjectiv;
   functions->fGetQueryObjectui64v = StubGLGetQueryObjectui64v;
   functions->fGetQueryObjectuiv = StubGLGetQueryObjectuiv;
   functions->fGetProgramInfoLog = StubGLGetProgramInfoLog;
   functions->fGetProgramiv = StubGLGetProgramiv;
@@ skipping 71 matching lines @@
   functions->fBlitFramebuffer = StubGLBlitFramebuffer;
   functions->fMapBuffer = StubGLMapBuffer;
   functions->fUnmapBuffer = StubGLUnmapBuffer;
   functions->fBindFragDataLocationIndexed =
     StubGLBindFragDataLocationIndexed;
 
   return interface;
 }
 
 }  // namespace gfx