[ios] Add Getters and Setters for user default browser promo interaction

Adds LogUserInteractionWithFullscreenPromo and
HasUserInteractedWithFullscreenPromoBefore to be able to set and
get the NSUserDefault config to keep track of user interaction
history with the fullscreen default browser promo. Adds calls to
LogUserInteractionWithFullscreenPromo.

Bug: 1107489
Change-Id: I5d73e6e93d8dd20682e65dfe9eb68ef10ca63632
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363660
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800749}

ios/chrome/browser/ui/whats_new/BUILD.gn

@@ -22,6 +22,7 @@ source_set("whats_new") {
   ]
 
   deps = [
+    ":utils",
     "//base",
     "//ios/chrome/app/strings:ios_google_chrome_strings",
     "//ios/chrome/browser/ui/coordinators:chrome_coordinators",

ios/chrome/browser/ui/whats_new/default_browser_promo_coordinator.mm

@@ -8,6 +8,7 @@
 #include "base/metrics/user_metrics.h"
 #include "base/metrics/user_metrics_action.h"
 #import "ios/chrome/browser/ui/whats_new/default_browser_promo_view_controller.h"
+#import "ios/chrome/browser/ui/whats_new/default_browser_utils.h"
 #import "ios/chrome/common/ui/confirmation_alert/confirmation_alert_action_handler.h"
 #import "ios/chrome/common/ui/elements/popover_label_view_controller.h"
 #include "ios/chrome/grit/ios_google_chrome_strings.h"
@@ -67,11 +68,13 @@ enum IOSDefaultBrowserFullscreenPromoAction {
 
 - (void)confirmationAlertDismissAction {
   UMA_HISTOGRAM_ENUMERATION("IOS.DefaultBrowserFullscreenPromo", CANCEL);
+  LogUserInteractionWithFullscreenPromo();
   [self.handler hidePromo];
 }
 
 - (void)confirmationAlertPrimaryAction {
   UMA_HISTOGRAM_ENUMERATION("IOS.DefaultBrowserFullscreenPromo", ACTION_BUTTON);
+  LogUserInteractionWithFullscreenPromo();
   [[UIApplication sharedApplication]
                 openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]
                 options:{}

ios/chrome/browser/ui/whats_new/default_browser_utils.h

@@ -17,8 +17,20 @@ extern NSString* const kLastHTTPURLOpenTime;
 // past expired logs that have happened too far in the past.
 void LogLikelyInterestedDefaultBrowserUserActivity();
 
-// Returns True if the last URL open is within the time threshold that would
-// indicate Chrome is likely still the default browser. Returns False otherwise.
+// Returns true if the user has interacted with the Fullscreen Promo previously.
+// Returns false otherwise.
+bool HasUserInteractedWithFullscreenPromoBefore();
+
+// Logs that the user has interacted with the Fullscreen Promo.
+void LogUserInteractionWithFullscreenPromo();
+
+// Returns true if the last URL open is within the time threshold that would
+// indicate Chrome is likely still the default browser. Returns false otherwise.
 bool IsChromeLikelyDefaultBrowser();
 
+// Returns true if the past behavior of the user indicates that the user fits
+// the categorization that would likely benefit from having Chrome set as their
+// default browser. Returns false otherwise.
+bool IsLikelyInterestedDefaultBrowserUser();
+
 #endif  // IOS_CHROME_BROWSER_UI_WHATS_NEW_DEFAULT_BROWSER_UTILS_H_

ios/chrome/browser/ui/whats_new/default_browser_utils.mm

@@ -13,6 +13,9 @@
 namespace {
 NSString* const kLastSignificantUserEvent = @"lastSignificantUserEvent";
 
+NSString* const kUserHasInteractedWithFullscreenPromo =
+    @"userHasInteractedWithFullscreenPromo";
+
 // Time threshold before activity timestamps should be removed. Currently set to
 // seven days.
 const NSTimeInterval kUserActivityTimestampExpiration = 7 * 24 * 60 * 60;
@@ -23,22 +26,27 @@ const NSTimeInterval kLatestURLOpenForDefaultBrowser = 7 * 24 * 60 * 60;
 
 NSString* const kLastHTTPURLOpenTime = @"lastHTTPURLOpenTime";
 
+// Helper function to clear all timestamps that occur later than 7 days ago.
+NSMutableArray<NSDate*>* SanitizePastUserEvents(
+    NSMutableArray<NSDate*>* pastUserEvents) {
+  NSDate* sevenDaysAgoDate =
+      [NSDate dateWithTimeIntervalSinceNow:-kUserActivityTimestampExpiration];
+  NSUInteger firstUnexpiredIndex = [pastUserEvents
+      indexOfObjectPassingTest:^BOOL(NSDate* date, NSUInteger idx, BOOL* stop) {
+        return ([date laterDate:sevenDaysAgoDate] == date);
+      }];
+  if (firstUnexpiredIndex != NSNotFound && firstUnexpiredIndex > 0) {
+    [pastUserEvents removeObjectsInRange:NSMakeRange(0, firstUnexpiredIndex)];
+  }
+  return pastUserEvents;
+}
+
 void LogLikelyInterestedDefaultBrowserUserActivity() {
   NSMutableArray<NSDate*>* pastUserEvents =
       [[[NSUserDefaults standardUserDefaults]
           arrayForKey:kLastSignificantUserEvent] mutableCopy];
   if (pastUserEvents) {
-    NSDate* sevenDaysAgoDate =
-        [NSDate dateWithTimeIntervalSinceNow:-kUserActivityTimestampExpiration];
-    // Clear all timestamps that occur later than 7 days ago.
-    NSUInteger firstUnexpiredIndex =
-        [pastUserEvents indexOfObjectPassingTest:^BOOL(
-                            NSDate* date, NSUInteger idx, BOOL* stop) {
-          return ([date laterDate:sevenDaysAgoDate] == date);
-        }];
-    if (firstUnexpiredIndex != NSNotFound && firstUnexpiredIndex > 0) {
-      [pastUserEvents removeObjectsInRange:NSMakeRange(0, firstUnexpiredIndex)];
-    }
+    pastUserEvents = SanitizePastUserEvents(pastUserEvents);
     [pastUserEvents addObject:[NSDate date]];
   } else {
     pastUserEvents = [NSMutableArray arrayWithObject:[NSDate date]];
@@ -48,6 +56,17 @@ void LogLikelyInterestedDefaultBrowserUserActivity() {
                                             forKey:kLastSignificantUserEvent];
 }
 
+bool HasUserInteractedWithFullscreenPromoBefore() {
+  return [[NSUserDefaults standardUserDefaults]
+      boolForKey:kUserHasInteractedWithFullscreenPromo];
+}
+
+void LogUserInteractionWithFullscreenPromo() {
+  [[NSUserDefaults standardUserDefaults]
+      setBool:YES
+       forKey:kUserHasInteractedWithFullscreenPromo];
+}
+
 bool IsChromeLikelyDefaultBrowser() {
   NSDate* lastURLOpen =
       [[NSUserDefaults standardUserDefaults] objectForKey:kLastHTTPURLOpenTime];
@@ -62,3 +81,11 @@ bool IsChromeLikelyDefaultBrowser() {
   }
   return true;
 }
+
+bool IsLikelyInterestedDefaultBrowserUser() {
+  NSMutableArray<NSDate*>* pastUserEvents =
+      [[[NSUserDefaults standardUserDefaults]
+          arrayForKey:kLastSignificantUserEvent] mutableCopy];
+  pastUserEvents = SanitizePastUserEvents(pastUserEvents);
+  return [pastUserEvents count] > 1;
+}