[ios] Fix omnibox baseWritingDirection and dismissal iOS11 bugs.

ios/chrome/browser/ui/omnibox/omnibox_popup_material_view_controller.mm

Index: ios/chrome/browser/ui/omnibox/omnibox_popup_material_view_controller.mm
diff --git a/ios/chrome/browser/ui/omnibox/omnibox_popup_material_view_controller.mm b/ios/chrome/browser/ui/omnibox/omnibox_popup_material_view_controller.mm
index 1493aa7d09d04cbc5e3acf0a93cc67ec603b3f07..f6da302cf26962e5c8faca8023fc10e73d74d899 100644
--- a/ios/chrome/browser/ui/omnibox/omnibox_popup_material_view_controller.mm
+++ b/ios/chrome/browser/ui/omnibox/omnibox_popup_material_view_controller.mm
@@ -656,11 +656,18 @@ initWithPopupView:(OmniboxPopupViewIOS*)view
 #pragma mark UIScrollViewDelegate
 
 - (void)scrollViewDidScroll:(UIScrollView*)scrollView {
-  // Setting the top inset of the scrollView to |kTopAndBottomPadding| causes a
-  // one time scrollViewDidScroll to |-kTopAndBottomPadding|.  It's easier to
-  // just ignore this one scroll tick.
-  if (scrollView.contentOffset.y == 0 - kTopAndBottomPadding)
-    return;
+  // TODO(crbug.com/733650): Default to the dragging check once it's been tested
+  // on trunk.
+  if (base::ios::IsRunningOnIOS11OrLater()) {
+    if (!scrollView.dragging)
+      return;
+  } else {
+    // Setting the top inset of the scrollView to |kTopAndBottomPadding| causes
+    // a one time scrollViewDidScroll to |-kTopAndBottomPadding|.  It's easier
+    // to just ignore this one scroll tick.
+    if (scrollView.contentOffset.y == 0 - kTopAndBottomPadding)
+      return;
+  }
 
   _popupView->DidScroll();
   for (OmniboxPopupMaterialRow* row in _rows) {