[iOS][MF] Reset input accessory when moving to background

Bug: 1001409
Change-Id: I2c97c64a9fded5935dda6142d0be18b00bef230f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803444Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697215}

ios/chrome/browser/ui/autofill/form_input_accessory/form_input_accessory_coordinator.mm

@@ -185,6 +185,11 @@
   }
 }
 
+- (void)mediatorDidDetectMovingToBackground:
+    (FormInputAccessoryMediator*)mediator {
+  [self.formInputAccessoryViewController reset];
+}
+
 #pragma mark - ManualFillAccessoryViewControllerDelegate
 
 - (void)keyboardButtonPressed {

ios/chrome/browser/ui/autofill/form_input_accessory/form_input_accessory_mediator.h

@@ -35,6 +35,11 @@ class WebStateList;
 // present on the screen.
 - (void)mediatorDidDetectKeyboardHide:(FormInputAccessoryMediator*)mediator;
 
+// The mediator detected that the keyboard was hidden and it is no longer
+// present on the screen.
+- (void)mediatorDidDetectMovingToBackground:
+    (FormInputAccessoryMediator*)mediator;
+
 @end
 
 // This class contains all the logic to get and provide keyboard input accessory

ios/chrome/browser/ui/autofill/form_input_accessory/form_input_accessory_mediator.mm

@@ -169,37 +169,42 @@
                       selector:@selector(handleTextInputDidEndEditing:)
                           name:UITextFieldTextDidEndEditingNotification
                         object:nil];
+    [defaultCenter addObserver:self
+                      selector:@selector(applicationDidEnterBackground:)
+                          name:UIApplicationDidEnterBackgroundNotification
+                        object:nil];
+
     _keyboardObserver = [[KeyboardObserverHelper alloc] init];
     _keyboardObserver.consumer = self;
-  }
-  // In BVC unit tests the password store doesn't exist. Skip creating the
-  // fetcher.
-  // TODO:(crbug.com/878388) Remove this workaround.
-  if (passwordStore) {
-    _passwordFetcher =
-        [[PasswordFetcher alloc] initWithPasswordStore:passwordStore
-                                              delegate:self
-                                                   URL:GURL::EmptyGURL()];
-  }
-  if (personalDataManager) {
-    _personalDataManager = personalDataManager;
-    _personalDataManagerObserver.reset(
-        new autofill::PersonalDataManagerObserverBridge(self));
-    personalDataManager->AddObserver(_personalDataManagerObserver.get());
-
-    // TODO:(crbug.com/845472) Add earl grey test to verify the credit card
-    // button is hidden when local cards are saved and then
-    // kAutofillCreditCardEnabled is changed to disabled.
-    consumer.creditCardButtonHidden =
-        personalDataManager->GetCreditCards().empty();
-
-    consumer.addressButtonHidden =
-        personalDataManager->GetProfilesToSuggest().empty();
-  } else {
-    consumer.creditCardButtonHidden = YES;
-    consumer.addressButtonHidden = YES;
-  }
 
+    // In BVC unit tests the password store doesn't exist. Skip creating the
+    // fetcher.
+    // TODO:(crbug.com/878388) Remove this workaround.
+    if (passwordStore) {
+      _passwordFetcher =
+          [[PasswordFetcher alloc] initWithPasswordStore:passwordStore
+                                                delegate:self
+                                                     URL:GURL::EmptyGURL()];
+    }
+    if (personalDataManager) {
+      _personalDataManager = personalDataManager;
+      _personalDataManagerObserver.reset(
+          new autofill::PersonalDataManagerObserverBridge(self));
+      personalDataManager->AddObserver(_personalDataManagerObserver.get());
+
+      // TODO:(crbug.com/845472) Add earl grey test to verify the credit card
+      // button is hidden when local cards are saved and then
+      // kAutofillCreditCardEnabled is changed to disabled.
+      consumer.creditCardButtonHidden =
+          personalDataManager->GetCreditCards().empty();
+
+      consumer.addressButtonHidden =
+          personalDataManager->GetProfilesToSuggest().empty();
+    } else {
+      consumer.creditCardButtonHidden = YES;
+      consumer.addressButtonHidden = YES;
+    }
+  }
   return self;
 }
 
@@ -507,6 +512,11 @@
   }
 }
 
+// Inform the delegate that the app went to the background.
+- (void)applicationDidEnterBackground:(NSNotification*)notification {
+  [self.delegate mediatorDidDetectMovingToBackground:self];
+}
+
 #pragma mark - Keyboard Notifications
 
 // When any text field or text view (e.g. omnibox, settings search bar)