Move flush id from WebGraphicsContext3DImpl to GLES2Implementation.

mojo/public/c/gles2/gles2_call_visitor_chromium_extension_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 361 matching lines @@
                background_color,
                edge_aa_mask,
                bounds_rect,
                is_clipped,
                clip_rect,
                sorting_context_id,
                transform))
 VISIT_GL_CALL(CommitOverlayPlanesCHROMIUM, void, (), ())
 VISIT_GL_CALL(SwapInterval, void, (GLint interval), (interval))
 VISIT_GL_CALL(FlushDriverCachesCHROMIUM, void, (), ())
+VISIT_GL_CALL(GetLastFlushIdCHROMIUM, GLuint, (), ())
 VISIT_GL_CALL(MatrixLoadfCHROMIUM,
               void,
               (GLenum matrixMode, const GLfloat* m),
               (matrixMode, m))
 VISIT_GL_CALL(MatrixLoadIdentityCHROMIUM,
               void,
               (GLenum matrixMode),
               (matrixMode))
 VISIT_GL_CALL(GenPathsCHROMIUM, GLuint, (GLsizei range), (range))
 VISIT_GL_CALL(DeletePathsCHROMIUM,
@@ skipping 185 matching lines @@
 VISIT_GL_CALL(GetFragDataIndexEXT,
               GLint,
               (GLuint program, const char* name),
               (program, name))
 VISIT_GL_CALL(UniformMatrix4fvStreamTextureMatrixCHROMIUM,
               void,
               (GLint location,
                GLboolean transpose,
                const GLfloat* default_value),
               (location, transpose, default_value))