Add a testing switch to override the query for other forms of browsing history

ios/chrome/browser/ui/webui/history/history_ui.mm

Index: ios/chrome/browser/ui/webui/history/history_ui.mm
diff --git a/ios/chrome/browser/ui/webui/history/history_ui.cc b/ios/chrome/browser/ui/webui/history/history_ui.mm
similarity index 88%
rename from ios/chrome/browser/ui/webui/history/history_ui.cc
rename to ios/chrome/browser/ui/webui/history/history_ui.mm
index aa00f0586baf2e1cc81c3680768e12678844e9f5..1d798b5b61bfea585446c76132e216ba3ac52894 100644
--- a/ios/chrome/browser/ui/webui/history/history_ui.cc
+++ b/ios/chrome/browser/ui/webui/history/history_ui.mm
@@ -8,19 +8,23 @@
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
+#include "components/browsing_data_ui/history_notice_utils.h"
 #include "components/grit/components_scaled_resources.h"
 #include "components/keyed_service/core/service_access_type.h"
+#include "components/prefs/pref_service.h"
 #include "components/search/search.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "components/strings/grit/components_strings.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_switches.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
+#include "ios/chrome/browser/pref_names.h"
 #include "ios/chrome/browser/signin/signin_manager_factory.h"
 #include "ios/chrome/browser/ui/webui/history/browsing_history_handler.h"
 #include "ios/chrome/browser/ui/webui/history/metrics_handler.h"
 #include "ios/chrome/grit/ios_resources.h"
 #include "ios/public/provider/web/web_ui_ios.h"
+#include "ios/web/public/web_state/web_state.h"
 #include "ios/web/public/web_ui_ios_data_source.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -132,6 +136,20 @@ HistoryUI::HistoryUI(web::WebUIIOS* web_ui) : web::WebUIIOSController(web_ui) {
   web_ui->AddMessageHandler(new BrowsingHistoryHandler());
   web_ui->AddMessageHandler(new MetricsHandler());
 
+  // TODO(crbug.com/595332): Since the API to query other forms of browsing
+  // history is not ready yet, make it possible to test the history UI as if
+  // it were. If the user opens chrome://history/?reset_ofbh, we will assume
+  // that other forms of browsing history exist (for all accounts), and we will
+  // also reset the one-time notice shown in the Clear Browsing Data dialog.
+  // This code should be removed as soon as the API is ready.
+  GURL url = web_ui->GetWebState()->GetVisibleURL();
+  if (url.has_query() && url.query() == "reset_ofbh") {
+    ios::ChromeBrowserState::FromWebUIIOS(web_ui)->GetPrefs()->SetInteger(
+        prefs::kClearBrowsingDataHistoryNoticeShownTimes, 0);
+    browsing_data_ui::testing::
+        g_override_other_forms_of_browsing_history_query = true;
+  }
+
   // Set up the chrome://history-frame/ source.
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromWebUIIOS(web_ui);