[iOS][multiball] Move signinInteractionCoordinator to SceneController.

Reparents signinInteractionCooordinator and cleans up guts interfaces.

Note the new method in SceneControllerGuts that allows MC to cleanup
a SC before shutdown. I think this is fine at least temporarily, but
we need to iron out how this happens in iOS 12 compat in the future.

Bug: none
Change-Id: Ie214b60b830548f1aaec56207298cdf6ba6ddd3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007051
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733427}

ios/chrome/app/BUILD.gn

@@ -228,7 +228,6 @@ source_set("app_internal") {
     "//ios/chrome/browser/ui/settings",
     "//ios/chrome/browser/ui/settings:settings_root",
     "//ios/chrome/browser/ui/settings/google_services",
-    "//ios/chrome/browser/ui/signin_interaction",
     "//ios/chrome/browser/ui/tab_grid",
     "//ios/chrome/browser/ui/tab_grid:tab_grid_ui",
     "//ios/chrome/browser/ui/table_view",

ios/chrome/app/main_controller.mm

@@ -123,7 +123,6 @@
 #import "ios/chrome/browser/ui/main/scene_controller_guts.h"
 #import "ios/chrome/browser/ui/promos/signin_promo_view_controller.h"
 #import "ios/chrome/browser/ui/settings/settings_navigation_controller.h"
-#import "ios/chrome/browser/ui/signin_interaction/signin_interaction_coordinator.h"
 #include "ios/chrome/browser/ui/tab_grid/tab_grid_coordinator.h"
 #import "ios/chrome/browser/ui/tab_grid/tab_switcher.h"
 #import "ios/chrome/browser/ui/tab_grid/view_controller_swapping.h"
@@ -431,7 +430,6 @@ void MainControllerAuthenticationServiceDelegate::ClearBrowsingData(
 @synthesize appURLLoadingService;
 @synthesize isProcessingTabSwitcherCommand;
 @synthesize isProcessingVoiceSearchCommand;
-@synthesize signinInteractionCoordinator;
 @synthesize dismissingTabSwitcher = _dismissingTabSwitcher;
 @synthesize restoreHelper = _restoreHelper;
 
@@ -756,11 +754,6 @@ void MainControllerAuthenticationServiceDelegate::ClearBrowsingData(
   return [[PreviousSessionInfo sharedInstance] isFirstSessionAfterUpgrade];
 }
 
-- (BOOL)isSettingsViewPresented {
-  return [self.sceneController hasSettingsNavigationController] ||
-         self.signinInteractionCoordinator.isSettingsViewPresented;
-}
-
 #pragma mark - StartupInformation implementation.
 
 - (FirstUserActionRecorder*)firstUserActionRecorder {
@@ -784,9 +777,8 @@ void MainControllerAuthenticationServiceDelegate::ClearBrowsingData(
 }
 
 - (void)stopChromeMain {
-  // The UI should be stopped before the models they observe are stopped.
-  [self.signinInteractionCoordinator cancel];
-  self.signinInteractionCoordinator = nil;
+  // Teardown UI state that is associated with scenes.
+  [self.sceneController teardownUI];
 
   [_mainCoordinator stop];
   _mainCoordinator = nil;

ios/chrome/app/main_controller_guts.h

@@ -18,7 +18,6 @@
 @class BrowserViewController;
 @class BrowserViewWrangler;
 @class HistoryCoordinator;
-@class SigninInteractionCoordinator;
 @class TabGridCoordinator;
 @protocol BrowserInterfaceProvider;
 @protocol TabSwitcher;
@@ -56,11 +55,6 @@ enum class TabSwitcherDismissalMode { NONE, NORMAL, INCOGNITO };
 // exclusive chrome commands sent at nearly the same time.
 @property(nonatomic, assign) BOOL isProcessingTabSwitcherCommand;
 @property(nonatomic, assign) BOOL isProcessingVoiceSearchCommand;
-// The SigninInteractionCoordinator to present Sign In UI. It is created the
-// first time Sign In UI is needed to be presented and should not be destroyed
-// while the UI is presented.
-@property(nonatomic, strong)
-    SigninInteractionCoordinator* signinInteractionCoordinator;
 
 // If YES, the tab switcher is currently active.
 @property(nonatomic, assign, getter=isTabSwitcherActive)
@@ -69,11 +63,6 @@ enum class TabSwitcherDismissalMode { NONE, NORMAL, INCOGNITO };
 // YES while animating the dismissal of tab switcher.
 @property(nonatomic, assign) BOOL dismissingTabSwitcher;
 
-// Returns YES if the settings are presented, either from
-// self.settingsNavigationController or from SigninInteractionCoordinator.
-@property(nonatomic, assign, readonly, getter=isSettingsViewPresented)
-    BOOL settingsViewPresented;
-
 // If not NONE, the current BVC should be switched to this BVC on completion
 // of tab switcher dismissal.
 @property(nonatomic, assign)

ios/chrome/browser/ui/main/scene_controller_guts.h

@@ -60,15 +60,18 @@ class ChromeBrowserState;
 - (void)presentSignedInAccountsViewControllerForBrowserState:
     (ios::ChromeBrowserState*)browserState;
 
-// Returns YES if the settings navigation controller exists.
-- (BOOL)hasSettingsNavigationController;
-
 // Clears incognito data that is specific to iOS and won't be cleared by
 // deleting the browser state.
 - (void)clearIOSSpecificIncognitoData;
 
 - (void)activateBVCAndMakeCurrentBVCPrimary;
 
+#pragma mark - iOS 12 compat
+
+// Method called on SceneController when the scene disconnects. Exposed here for
+// iOS 12 compatibility.
+- (void)teardownUI;
+
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_MAIN_SCENE_CONTROLLER_GUTS_H_