iOS: Mark HTTP pages with password fields with an omnibox icon.

ios/web/public/web_state/web_state.h

Index: ios/web/public/web_state/web_state.h
diff --git a/ios/web/public/web_state/web_state.h b/ios/web/public/web_state/web_state.h
index 08819be722df8b83e3bd836ccf4311e7f4fe3700..64fb0f2557edf1a8e1c65594ee1ac25ffa402635 100644
--- a/ios/web/public/web_state/web_state.h
+++ b/ios/web/public/web_state/web_state.h
@@ -200,6 +200,10 @@ class WebState : public base::SupportsUserData {
   // Returns the currently visible WebInterstitial if one is shown.
   virtual WebInterstitial* GetWebInterstitial() const = 0;
 
+  // Tells the WebState that the current page is an HTTP page
+  // containing a password field.
+  virtual void OnPasswordInputShownOnHttp() = 0;
+
   // Callback used to handle script commands.
   // The callback must return true if the command was handled, and false
   // otherwise.