[ios] Stop the NTP on web usage toggle.

This happens when clearing browser data, and forces the NTP
to be recreated (and not show previous NTP tiles).

Bug: 905735
Change-Id: If818e02703c7324f0a660bf6b115603db3682b74
Reviewed-on: https://chromium-review.googlesource.com/c/1339340Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608947}

ios/chrome/browser/ntp_tiles/ntp_tiles_egtest.mm

@@ -8,6 +8,7 @@
 #import "ios/chrome/test/app/history_test_util.h"
 #import "ios/chrome/test/app/tab_test_util.h"
 #import "ios/chrome/test/earl_grey/chrome_earl_grey.h"
+#import "ios/chrome/test/earl_grey/chrome_earl_grey_ui.h"
 #import "ios/chrome/test/earl_grey/chrome_matchers.h"
 #import "ios/chrome/test/earl_grey/chrome_test_case.h"
 #import "ios/web/public/test/http_server/html_response_provider.h"
@@ -19,6 +20,11 @@
 #error "This file requires ARC support."
 #endif
 
+using chrome_test_util::ClearBrowsingDataCell;
+using chrome_test_util::ClearBrowsingDataButton;
+using chrome_test_util::ConfirmClearBrowsingDataButton;
+using chrome_test_util::SettingsDoneButton;
+using chrome_test_util::SettingsMenuPrivacyButton;
 using web::test::HttpServer;
 
 // Test case for NTP tiles.
@@ -116,6 +122,20 @@ using web::test::HttpServer;
   [[EarlGrey selectElementWithMatcher:
                  chrome_test_util::StaticTextWithAccessibilityLabel(@"title1")]
       assertWithMatcher:grey_nil()];
+
+  // Clear history and verify that the tile does not exist.
+  [ChromeEarlGreyUI openSettingsMenu];
+  [ChromeEarlGreyUI tapSettingsMenuButton:SettingsMenuPrivacyButton()];
+  [ChromeEarlGreyUI tapPrivacyMenuButton:ClearBrowsingDataCell()];
+  [ChromeEarlGreyUI tapClearBrowsingDataMenuButton:ClearBrowsingDataButton()];
+  [[EarlGrey selectElementWithMatcher:ConfirmClearBrowsingDataButton()]
+      performAction:grey_tap()];
+  [[EarlGrey selectElementWithMatcher:SettingsDoneButton()]
+      performAction:grey_tap()];
+
+  [[EarlGrey selectElementWithMatcher:
+                 chrome_test_util::StaticTextWithAccessibilityLabel(@"title2")]
+      assertWithMatcher:grey_nil()];
 }
 
 @end

ios/chrome/browser/ui/browser_view_controller.mm

@@ -1050,6 +1050,15 @@ applicationCommandEndpoint:(id<ApplicationCommands>)applicationCommandEndpoint
   [self updateDialogPresenterActiveState];
   [self updateBroadcastState];
 
+  // Stop the NTP on web usage toggle. This happens when clearing browser
+  // data, and forces the NTP to be recreated in -displayTab below.
+  // TODO(crbug.com/906199): Move this to the NewTabPageTabHelper when
+  // WebStateObserver has a webUsage callback.
+  if (!active) {
+    for (const auto& element : _ntpCoordinatorsForWebStates)
+      [element.second stop];
+  }
+
   if (active) {
     // Make sure the tab (if any; it's possible to get here without a current
     // tab if the caller is about to create one) ends up on screen completely.

ios/chrome/test/earl_grey/chrome_matchers.h

@@ -134,6 +134,13 @@ id<GREYMatcher> AddAccountButton();
 // Returns matcher for the sign out accounts button.
 id<GREYMatcher> SignOutAccountsButton();
 
+// Returns matcher for the Clear Browsing Data cell on the Privacy screen.
+id<GREYMatcher> ClearBrowsingDataCell();
+
+// Returns matcher for the clear browsing data button on the clear browsing data
+// panel.
+id<GREYMatcher> ClearBrowsingDataButton();
+
 // Returns matcher for the clear browsing data collection view.
 id<GREYMatcher> ClearBrowsingDataCollectionView();
 

ios/chrome/test/earl_grey/chrome_matchers.mm

@@ -343,6 +343,14 @@ id<GREYMatcher> SignOutAccountsButton() {
   return grey_accessibilityID(kSettingsAccountsSignoutCellId);
 }
 
+id<GREYMatcher> ClearBrowsingDataCell() {
+  return ButtonWithAccessibilityLabelId(IDS_IOS_CLEAR_BROWSING_DATA_TITLE);
+}
+
+id<GREYMatcher> ClearBrowsingDataButton() {
+  return ButtonWithAccessibilityLabelId(IDS_IOS_CLEAR_BUTTON);
+}
+
 id<GREYMatcher> ClearBrowsingDataCollectionView() {
   return grey_accessibilityID(
       kClearBrowsingDataCollectionViewAccessibilityIdentifier);