NavigationSimulator: Simulate item and document sequence number.

Simulate Blink assigning an item and document sequence number to the
navigation. This is similar to what is done in
TestRenderFrameHost::SendNavigateWithParameters().

Bug: 728571
Change-Id: I6915d7e80154779c87294d71a1a395b862fc428b
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_browser_side_navigation_rel
Reviewed-on: https://chromium-review.googlesource.com/579380
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488310}

content/public/test/navigation_simulator.cc

@@ -328,8 +328,15 @@ void NavigationSimulator::Commit() {
   params.history_list_was_cleared = false;
   params.original_request_url = navigation_url_;
   params.was_within_same_document = false;
-  params.page_state =
-      PageState::CreateForTesting(navigation_url_, false, nullptr, nullptr);
+
+  // Simulate Blink assigning an item and document sequence number to the
+  // navigation.
+  params.item_sequence_number = base::Time::Now().ToDoubleT() * 1000000;
+  params.document_sequence_number = params.item_sequence_number + 1;
+
+  params.page_state = PageState::CreateForTestingWithSequenceNumbers(
+      navigation_url_, params.item_sequence_number,
+      params.document_sequence_number);
 
   render_frame_host_->SendNavigateWithParams(&params);
 
@@ -420,8 +427,16 @@ void NavigationSimulator::CommitErrorPage() {
   params.transition = transition_;
   params.was_within_same_document = false;
   params.url_is_unreachable = true;
-  params.page_state =
-      PageState::CreateForTesting(navigation_url_, false, nullptr, nullptr);
+
+  // Simulate Blink assigning an item and document sequence number to the
+  // navigation.
+  params.item_sequence_number = base::Time::Now().ToDoubleT() * 1000000;
+  params.document_sequence_number = params.item_sequence_number + 1;
+
+  params.page_state = PageState::CreateForTestingWithSequenceNumbers(
+      navigation_url_, params.item_sequence_number,
+      params.document_sequence_number);
+
   render_frame_host_->SendNavigateWithParams(&params);
 
   // Simulate the UnloadACK in the old RenderFrameHost if it was swapped out at