PlzNavigate: Implement RequestNavigation on the renderer side

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index 63f96b3392dffd134660d3b577326c1e26d962df..437f400ef4f57bf6abfa1bfaff49ab706a614a7b 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -57,8 +57,8 @@ class RenderWidgetHostImpl;
 class StreamHandle;
 class TimeoutMonitor;
 struct CommitNavigationParams;
-struct ContextMenuParams;
 struct CommonNavigationParams;
+struct ContextMenuParams;
 struct GlobalRequestID;
 struct Referrer;
 struct RequestNavigationParams;
@@ -347,6 +347,13 @@ class CONTENT_EXPORT RenderFrameHostImpl
   void DidCancelPopupMenu();
 #endif
 
+  // PlzNavigate
+  // Tells the renderer that there is a navigation request. The renderer should
+  // execute its beforeunload event and confirm the navigation by sending a
+  // FrameHostMsg_BeginNavigation to the browser.
+  void RequestNavigation(const CommonNavigationParams& common_params,
+                         const RequestNavigationParams& request_params);
+
   // PlzNavigate: Indicates that a navigation is ready to commit and can be
   // handled by this RenderFrame.
   void CommitNavigation(ResourceResponse* response,