[iOS][web] Extract userIsInteracting

Change-Id: I9c6b6e1e11566aea995e4dab7cf22175b2475395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584304Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654808}

ios/web/web_state/ui/crw_web_controller.mm

@@ -3845,7 +3845,7 @@ typedef void (^ViewportStateCompletion)(const web::PageViewportState*);
   // There is no reliable way to tell if there was a user gesture, so this code
   // checks if user has recently tapped on web view. TODO(crbug.com/809706):
   // Remove the usage of -userIsInteracting when rdar://19989909 is fixed.
-  bool initiatedByUser = [self userIsInteracting];
+  bool initiatedByUser = [self isUserInitiatedAction:action];
 
   if (UIAccessibilityIsVoiceOverRunning()) {
     // -userIsInteracting returns NO if VoiceOver is On. Inspect action's
@@ -3965,6 +3965,10 @@ typedef void (^ViewportStateCompletion)(const web::PageViewportState*);
 
 #pragma mark - WKUIDelegate Helpers
 
+- (BOOL)isUserInitiatedAction:(WKNavigationAction*)action {
+  return [self userIsInteracting];
+}
+
 // Helper to respond to |webView:runJavaScript...| delegate methods.
 // |completionHandler| must not be nil.
 - (void)runJavaScriptDialogOfType:(web::JavaScriptDialogType)type