Use WebHistoryItem.frameSequenceNumber() to find frames for history navigations

content/common/page_state_serialization_unittest.cc

 // 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.
 
 #include <math.h>
 
 #include "base/base64.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/pickle.h"
@@ skipping 87 matching lines @@
     frame_state->target = NS16("foo");
     frame_state->state_object = NS16(NULL);
     frame_state->document_state.push_back(NS16("1"));
     frame_state->document_state.push_back(NS16("q"));
     frame_state->document_state.push_back(NS16("text"));
     frame_state->document_state.push_back(NS16("dev.chromium.org"));
     frame_state->pinch_viewport_scroll_offset = gfx::PointF(10, 15);
     frame_state->scroll_offset = gfx::Point(0, 100);
     frame_state->item_sequence_number = 1;
     frame_state->document_sequence_number = 2;
+    frame_state->frame_sequence_number = 3;
     frame_state->page_scale_factor = 2.0;
   }
 
   void PopulateHttpBody(ExplodedHttpBody* http_body,
                         std::vector<base::NullableString16>* referenced_files) {
     http_body->is_null = false;
     http_body->identifier = 12345;
     http_body->contains_passwords = false;
     http_body->http_content_type = NS16("text/foo");
 
@@ skipping 18 matching lines @@
       bool is_child) {
     frame_state->url_string = NS16("http://chromium.org/");
     frame_state->referrer = NS16("http://google.com/");
     frame_state->referrer_policy = blink::WebReferrerPolicyDefault;
     if (!is_child)
       frame_state->target = NS16("target");
     frame_state->pinch_viewport_scroll_offset = gfx::PointF(-1, -1);
     frame_state->scroll_offset = gfx::Point(42, -42);
     frame_state->item_sequence_number = 123;
     frame_state->document_sequence_number = 456;
+    frame_state->frame_sequence_number = 789;
     frame_state->page_scale_factor = 2.0f;
 
     frame_state->document_state.push_back(
         NS16("\n\r?% WebKit serialized form state version 8 \n\r=&"));
     frame_state->document_state.push_back(NS16("form key"));
     frame_state->document_state.push_back(NS16("1"));
     frame_state->document_state.push_back(NS16("foo"));
     frame_state->document_state.push_back(NS16("file"));
     frame_state->document_state.push_back(NS16("2"));
     frame_state->document_state.push_back(NS16("file.txt"));
@@ skipping 261 matching lines @@
 }
 
 TEST_F(PageStateSerializationTest, BackwardsCompat_v16) {
   TestBackwardsCompat(16);
 }
 
 TEST_F(PageStateSerializationTest, BackwardsCompat_v18) {
   TestBackwardsCompat(18);
 }
 
+TEST_F(PageStateSerializationTest, BackwardsCompat_v20) {
+  TestBackwardsCompat(20);
+}
+
 }  // namespace
 }  // namespace content