Move flush id from WebGraphicsContext3DImpl to GLES2Implementation.

mojo/gpu/mojo_gles2_impl_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 765 matching lines @@
                                GLuint background_color,
                                GLuint edge_aa_mask,
                                const GLfloat* bounds_rect,
                                GLboolean is_clipped,
                                const GLfloat* clip_rect,
                                GLint sorting_context_id,
                                const GLfloat* transform) override;
   void CommitOverlayPlanesCHROMIUM() override;
   void SwapInterval(GLint interval) override;
   void FlushDriverCachesCHROMIUM() override;
+  GLuint GetLastFlushIdCHROMIUM() override;
   void MatrixLoadfCHROMIUM(GLenum matrixMode, const GLfloat* m) override;
   void MatrixLoadIdentityCHROMIUM(GLenum matrixMode) override;
   GLuint GenPathsCHROMIUM(GLsizei range) override;
   void DeletePathsCHROMIUM(GLuint path, GLsizei range) override;
   GLboolean IsPathCHROMIUM(GLuint path) override;
   void PathCommandsCHROMIUM(GLuint path,
                             GLsizei numCommands,
                             const GLubyte* commands,
                             GLsizei numCoords,
                             GLenum coordType,
@@ skipping 96 matching lines @@
       GLint location,
       GLboolean transpose,
       const GLfloat* default_value) override;
 
  private:
   MojoGLES2Context context_;
 };
 
 }  // namespace mojo
 #endif  // MOJO_GPU_MOJO_GLES2_IMPL_AUTOGEN_H_