PlzNavigate: identify same-page browser-initiated navigation.

content/public/browser/navigation_handle.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 138 matching lines @@
   // If PlzNavigate is active, the RenderFrameHost returned will be the final
   // host for the navigation. If PlzNavigate is inactive, the navigation may
   // transfer to a new host up until the point that DidFinishNavigation is
   // called.
   virtual RenderFrameHost* GetRenderFrameHost() = 0;
 
   // Whether the navigation happened in the same page. Examples of same page
   // navigations are:
   // * reference fragment navigations
   // * pushState/replaceState
+  // * same page history navigation
   virtual bool IsSamePage() = 0;
 
   // Whether the navigation has encountered a server redirect or not.
   virtual bool WasServerRedirect() = 0;
 
   // Lists the redirects that occurred on the way to the current page. The
   // current page is the last one in the list (so even when there's no redirect,
   // there will be one entry in the list).
   virtual const std::vector<GURL>& GetRedirectChain() = 0;
 
@@ skipping 104 matching lines @@
 
   // The NavigationData that the embedder returned from
   // ResourceDispatcherHostDelegate::GetNavigationData during commit. This will
   // be a clone of the NavigationData.
   virtual NavigationData* GetNavigationData() = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_