Reland of Add a unittest for PasswordController

ios/chrome/browser/passwords/password_controller.h

Index: ios/chrome/browser/passwords/password_controller.h
diff --git a/ios/chrome/browser/passwords/password_controller.h b/ios/chrome/browser/passwords/password_controller.h
index 498481fb14232df9809b2f19d04f95e08fa59326..f74a84503837557f78a4a68aafa7ab797b51769b 100644
--- a/ios/chrome/browser/passwords/password_controller.h
+++ b/ios/chrome/browser/passwords/password_controller.h
@@ -9,6 +9,7 @@
 #import "ios/chrome/browser/autofill/form_suggestion_provider.h"
 #import "ios/chrome/browser/passwords/ios_chrome_password_manager_client.h"
 #import "ios/chrome/browser/passwords/ios_chrome_password_manager_driver.h"
+#import "ios/web/public/web_state/web_state_observer_bridge.h"
 
 @protocol FormInputAccessoryViewProvider;
 @protocol PasswordsUiDelegate;
@@ -22,8 +23,9 @@ class PasswordManagerDriver;
 }  // namespace password_manager
 
 // Per-tab password controller. Handles password autofill and saving.
-@interface PasswordController
-    : NSObject<PasswordManagerClientDelegate, PasswordManagerDriverDelegate>
+@interface PasswordController : NSObject<CRWWebStateObserver,
+                                         PasswordManagerClientDelegate,
+                                         PasswordManagerDriverDelegate>
 
 // An object that can provide suggestions from this PasswordController.
 @property(readonly) id<FormSuggestionProvider> suggestionProvider;
@@ -46,8 +48,14 @@ class PasswordManagerDriver;
 
 // |webState| should not be nil.
 - (instancetype)initWithWebState:(web::WebState*)webState
-             passwordsUiDelegate:(id<PasswordsUiDelegate>)UIDelegate
-    NS_DESIGNATED_INITIALIZER;
+             passwordsUiDelegate:(id<PasswordsUiDelegate>)UIDelegate;
+
+// This is just for testing.
+- (instancetype)
+   initWithWebState:(web::WebState*)webState
+passwordsUiDelegate:(id<PasswordsUiDelegate>)UIDelegate
+             client:(scoped_ptr<password_manager::PasswordManagerClient>)
+                        passwordManagerClient NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)init NS_UNAVAILABLE;