PlzNavigate: fix timing issue in app window creation

content/test/web_contents_observer_sanity_checker.cc

 // 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.
 
 #include "content/test/web_contents_observer_sanity_checker.h"
 
 #include "base/strings/stringprintf.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/common/frame_messages.h"
 #include "content/public/browser/navigation_handle.h"
@@ skipping 125 matching lines @@
 void WebContentsObserverSanityChecker::DidRedirectNavigation(
     NavigationHandle* navigation_handle) {
   CHECK(NavigationIsOngoing(navigation_handle));
   CHECK(!NavigationIsOngoingAndCommitted(navigation_handle));
 
   CHECK(navigation_handle->GetNetErrorCode() == net::OK);
   CHECK(!navigation_handle->HasCommittedDocument());
   CHECK(!navigation_handle->HasCommittedErrorPage());
 }
 
+void WebContentsObserverSanityChecker::ReadyToCommitNavigation(
+    NavigationHandle* navigation_handle) {
+  CHECK(NavigationIsOngoing(navigation_handle));
+  CHECK(!NavigationIsOngoingAndCommitted(navigation_handle));
+
+  CHECK(!navigation_handle->HasCommittedDocument());
+  CHECK(!navigation_handle->HasCommittedErrorPage());
+}
+
 void WebContentsObserverSanityChecker::DidCommitNavigation(
     NavigationHandle* navigation_handle) {
   CHECK(NavigationIsOngoing(navigation_handle));
   CHECK(!NavigationIsOngoingAndCommitted(navigation_handle));
 
   CHECK_NE(navigation_handle->HasCommittedDocument(),
            navigation_handle->HasCommittedErrorPage());
   CHECK_IMPLIES(navigation_handle->HasCommittedDocument(),
                 navigation_handle->GetNetErrorCode() == net::OK);
   CHECK_IMPLIES(navigation_handle->HasCommittedErrorPage(),
@@ skipping 175 matching lines @@
   return it != ongoing_navigations_.end();
 }
 
 bool WebContentsObserverSanityChecker::NavigationIsOngoingAndCommitted(
     NavigationHandle* navigation_handle) {
   auto it = ongoing_committed_navigations_.find(navigation_handle);
   return it != ongoing_committed_navigations_.end();
 }
 
 }  // namespace content