command_buffer: Implement glGetStringi for GL ES 3.0

gpu/command_buffer/client/gles2_implementation_autogen.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
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 363 matching lines @@
                               GLint* range,
                               GLint* precision) override;
 
 void GetShaderSource(GLuint shader,
                      GLsizei bufsize,
                      GLsizei* length,
                      char* source) override;
 
 const GLubyte* GetString(GLenum name) override;
 
+const GLubyte* GetStringi(GLenum name, GLuint index) override;
+
 void GetSynciv(GLsync sync,
                GLenum pname,
                GLsizei bufsize,
                GLsizei* length,
                GLint* values) override;
 
 void GetTexParameterfv(GLenum target, GLenum pname, GLfloat* params) override;
 
 void GetTexParameteriv(GLenum target, GLenum pname, GLint* params) override;
 
@@ skipping 785 matching lines @@
                                     GLuint index,
                                     const char* name) override;
 
 void BindFragDataLocationEXT(GLuint program,
                              GLuint colorNumber,
                              const char* name) override;
 
 GLint GetFragDataIndexEXT(GLuint program, const char* name) override;
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_AUTOGEN_H_