Adding TabRestore PLM UMA

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index 0f3892c7015bb271d10eb5716dbc3c3aad61d274..f06bbc7b32b84fd875bc84e5ccb3ef5926ab962e 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -11,6 +11,7 @@
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_throttle.h"
 #include "content/public/browser/reload_type.h"
+#include "content/public/browser/restore_type.h"
 #include "content/public/common/referrer.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
@@ -105,6 +106,10 @@ class CONTENT_EXPORT NavigationHandle {
   // ReloadType::NONE.
   virtual ReloadType GetReloadType() = 0;
 
+  // Returns the restore type for this navigation. RestoreType::NONE is returned
+  // if the navigation is not a restore.
+  virtual RestoreType GetRestoreType() = 0;
+
   // Parameters available at network request start time ------------------------
   //
   // The following parameters are only available when the network request is