Upstream more leaf files in ios/web/web_state

ios/web/web_state/web_state_observer_bridge.mm

Index: ios/web/web_state/web_state_observer_bridge.mm
diff --git a/ios/web/web_state/web_state_observer_bridge.mm b/ios/web/web_state/web_state_observer_bridge.mm
index c2028fe80c45220934c64826ceeb01fae0bd7e39..fe1f6dbf258c95de3b0640ab87f5e0c45e90a6fd 100644
--- a/ios/web/web_state/web_state_observer_bridge.mm
+++ b/ios/web/web_state/web_state_observer_bridge.mm
@@ -30,6 +30,20 @@ void WebStateObserverBridge::NavigationItemCommitted(
   }
 }
 
+void WebStateObserverBridge::DidStartLoading() {
+  SEL selector = @selector(webStateDidStartLoading:);
+  if ([observer_ respondsToSelector:selector]) {
+    [observer_ webStateDidStartLoading:web_state()];
+  }
+}
+
+void WebStateObserverBridge::DidStopLoading() {
+  SEL selector = @selector(webStateDidStopLoading:);
+  if ([observer_ respondsToSelector:selector]) {
+    [observer_ webStateDidStopLoading:web_state()];
+  }
+}
+
 void WebStateObserverBridge::PageLoaded(
     web::PageLoadCompletionStatus load_completion_status) {
   SEL selector = @selector(webStateDidLoadPage:);