Ensure History > Recent Tabs restore preserves window disposition.

ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm

Index: ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
diff --git a/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm b/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
index b766c882e70e44099d5b5a91c97c7b3202579268..e3626680751768ecd9c8f8b54729207e1cd3685b 100644
--- a/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
+++ b/ios/chrome/browser/sessions/tab_restore_service_delegate_impl_ios.mm
@@ -66,10 +66,26 @@ sessions::LiveTab* TabRestoreServiceDelegateImplIOS::GetActiveLiveTab() const {
   return nullptr;
 }
 
+// Not supported by iOS.
 bool TabRestoreServiceDelegateImplIOS::IsTabPinned(int index) const {
   return false;
 }
 
+// Not supported by iOS.
+const gfx::Rect TabRestoreServiceDelegateImplIOS::GetBounds() const {
+  return gfx::Rect();
+}
+
+// Not supported by iOS.
+ui::WindowShowState TabRestoreServiceDelegateImplIOS::GetShowState() const {
+  return ui::SHOW_STATE_NORMAL;
+}
+
+// Not supported by iOS.
+std::string TabRestoreServiceDelegateImplIOS::GetWorkspace() const {
+  return std::string();
+}
+
 sessions::LiveTab* TabRestoreServiceDelegateImplIOS::AddRestoredTab(
     const std::vector<sessions::SerializedNavigationEntry>& navigations,
     int tab_index,