[ios] Correct new tab animation with fullscreen features enabled.

Also note that -correctMissingSafeArea in content suggestions VC can be
bypassed when the BrowserContainerFullscreen feature is enabled.

BUG: 849206, 836730
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Id876a66b1509cdec64a645b59c296186c31fa8e1
Reviewed-on: https://chromium-review.googlesource.com/c/1255984Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596203}

ios/chrome/browser/ui/browser_view_controller.mm

@@ -5080,8 +5080,11 @@ applicationCommandEndpoint:(id<ApplicationCommands>)applicationCommandEndpoint {
   // The animation will have the same frame as |self|, minus the status bar,
   // so shift it down and reduce its height accordingly.
   CGRect frame = self.view.bounds;
-  frame.origin.y += StatusBarHeight();
-  frame.size.height -= StatusBarHeight();
+  if (!self.usesFullscreenContainer ||
+      !base::FeatureList::IsEnabled(web::features::kOutOfWebFullscreen)) {
+    frame.origin.y += StatusBarHeight();
+    frame.size.height -= StatusBarHeight();
+  }
   frame = [self.contentArea convertRect:frame fromView:self.view];
   ForegroundTabAnimationView* animatedView =
       [[ForegroundTabAnimationView alloc] initWithFrame:frame];

ios/chrome/browser/ui/content_suggestions/content_suggestions_view_controller.mm

@@ -591,6 +591,9 @@ const CGFloat kCardBorderRadius = 11;
 // though content suggestions appear under the top safe area, they are blocked
 // by the browser container view controller.
 - (void)correctMissingSafeArea {
+  if (base::FeatureList::IsEnabled(web::features::kBrowserContainerFullscreen))
+    return;
+
   if (@available(iOS 11, *)) {
     UIEdgeInsets missingTop = UIEdgeInsetsZero;
     // During the new tab animation the browser container view controller