Added NavigationContext::IsPost.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index a47f2f09c0313b26aee3637519152d132ccf324f..c36d77a20c9de4700220e46632e6ee6ce50ab1d1 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -1396,7 +1396,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
       _pendingNavigationInfo
           ? [_pendingNavigationInfo HTTPMethod]
           : [self currentBackForwardListItemHolder]->http_method();
-  return [HTTPMethod isEqual:@"POST"];
+  return [HTTPMethod isEqual:@"POST"] || self.currentNavItem->HasPostData();
 }
 
 - (BOOL)isCurrentNavigationBackForward {
@@ -1540,6 +1540,7 @@ registerLoadRequestForURL:(const GURL&)requestURL
     item = self.navigationManagerImpl->GetLastCommittedItem();
   }
   context->SetNavigationItemUniqueID(item->GetUniqueID());
+  context->SetIsPost([self isCurrentNavigationItemPOST]);
   _webStateImpl->SetIsLoading(true);
   _webStateImpl->OnNavigationStarted(context.get());
   return context;
@@ -2049,6 +2050,8 @@ registerLoadRequestForURL:(const GURL&)requestURL
       // using the web view's reload. This ensures state processing and delegate
       // calls are consistent.
       // TODO(eugenebut): revisit this for WKWebView.
+      self.navigationManagerImpl->GetLastCommittedItem()->SetTransitionType(
+          ui::PAGE_TRANSITION_RELOAD);
       [self loadCurrentURL];
     }
   }