[ios] Mark Translate Infobar to skip banner if translating

This will allow the Overlay framework to not create an overlay request
when a user navigates to a page that is marked as auto-translate. This
is necessary because the initial translate step is TRANSLATING and
the Overlay framework responds to Infobar additions by presenting
a Banner, which should not happen if the BEFORE_TRANSLTE step is skipped.

Bug: 1071914
Change-Id: Ie174702b4e12f91da75d71fbb15850053a97e7ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154396
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760304}

ios/chrome/browser/translate/chrome_ios_translate_client.mm

@@ -97,7 +97,10 @@ std::unique_ptr<infobars::InfoBar> ChromeIOSTranslateClient::CreateInfoBar(
     TranslateInfobarCoordinator* coordinator =
         [[TranslateInfobarCoordinator alloc]
             initWithInfoBarDelegate:delegate.get()];
-    return std::make_unique<InfoBarIOS>(coordinator, std::move(delegate));
+    bool skip_banner = delegate->translate_step() ==
+                       translate::TranslateStep::TRANSLATE_STEP_TRANSLATING;
+    return std::make_unique<InfoBarIOS>(coordinator, std::move(delegate),
+                                        skip_banner);
   } else {
     TranslateInfoBarController* controller = [[TranslateInfoBarController alloc]
         initWithInfoBarDelegate:delegate.get()];