add pagination info to DistilledPageProto

components/dom_distiller/core/proto/distilled_page.proto

 // Copyright 2013 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.
 //
 // Distilled page content.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
@@ skipping 24 matching lines @@
   message DebugInfo {
     // Contains the log from the JS distiller.
     optional string log = 1;
   }
 
   // Debug information about this page.
   optional DebugInfo debug_info = 6;
 
   // text directionality
   optional string text_direction = 7;
+
+  message PaginationInfo {
+    optional string next_page = 1;
+    optional string prev_page = 2;
+    optional string canonical_page = 3;
+  }
+
+  // Pagination info for this page.
+  optional PaginationInfo pagination_info = 8;
 }