Upstream more leaf files in ios/web/web_state

ios/web/public/web_state/web_state_observer_bridge.h

Index: ios/web/public/web_state/web_state_observer_bridge.h
diff --git a/ios/web/public/web_state/web_state_observer_bridge.h b/ios/web/public/web_state/web_state_observer_bridge.h
index e61bea4418a730d5fd531f25a8f3be39ca06e60a..17b4a9f8275d253cec003adcb50481085b7d243f 100644
--- a/ios/web/public/web_state/web_state_observer_bridge.h
+++ b/ios/web/public/web_state/web_state_observer_bridge.h
@@ -70,6 +70,12 @@ class GURL;
 // is no longer valid.
 - (void)webStateDestroyed:(web::WebState*)webState;
 
+// Invoked by WebStateObserverBridge::DidStopLoading.
+- (void)webStateDidStopLoading:(web::WebState*)webState;
+
+// Invoked by WebStateObserverBridge::DidStartLoading.
+- (void)webStateDidStartLoading:(web::WebState*)webState;
+
 @end
 
 namespace web {
@@ -108,6 +114,8 @@ class WebStateObserverBridge : public web::WebStateObserver {
                              bool user_initiated) override;
   void FaviconUrlUpdated(const std::vector<FaviconURL>& candidates) override;
   void WebStateDestroyed() override;
+  void DidStartLoading() override;
+  void DidStopLoading() override;
 
  private:
   base::WeakNSProtocol<id<CRWWebStateObserver>> observer_;