Showing previews UI for Offline Previews

chrome/browser/android/offline_pages/offline_page_utils.cc

Index: chrome/browser/android/offline_pages/offline_page_utils.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_utils.cc b/chrome/browser/android/offline_pages/offline_page_utils.cc
index d6cbffe2923dcdde80726881a4b9c3f839c09c1d..2768e1ed8c2bd422f6020240c07829f43a770286 100644
--- a/chrome/browser/android/offline_pages/offline_page_utils.cc
+++ b/chrome/browser/android/offline_pages/offline_page_utils.cc
@@ -7,20 +7,21 @@
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/android/offline_pages/offline_page_mhtml_archiver.h"
 #include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
 #include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
 #include "chrome/browser/android/tab_android.h"
+#include "chrome/browser/previews/previews_infobar_tab_helper.h"
 #include "components/offline_pages/client_namespace_constants.h"
 #include "components/offline_pages/offline_page_feature.h"
 #include "components/offline_pages/offline_page_item.h"
 #include "components/offline_pages/offline_page_model.h"
 #include "components/offline_pages/request_header/offline_page_header.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/web_contents.h"
 #include "url/gurl.h"
 
 namespace offline_pages {
@@ -174,21 +175,30 @@ const OfflinePageItem* OfflinePageUtils::GetOfflinePageFromWebContents(
   GURL web_contents_url =
       web_contents->GetVisibleURL().ReplaceComponents(remove_params);
   return offline_url == web_contents_url ? offline_page : nullptr;
 }
 
 // static
 const OfflinePageHeader* OfflinePageUtils::GetOfflineHeaderFromWebContents(
     content::WebContents* web_contents) {
   OfflinePageTabHelper* tab_helper =
       OfflinePageTabHelper::FromWebContents(web_contents);
-  return tab_helper ? &(tab_helper->offline_header()) : nullptr;
+  return tab_helper ? tab_helper->offline_header() : nullptr;
+}
+
+// static
+bool OfflinePageUtils::IsShowingOfflinePreview(
+    content::WebContents* web_contents) {
+  PreviewsInfoBarTabHelper* previews_tab_helper =
+      PreviewsInfoBarTabHelper::FromWebContents(web_contents);
+  return previews_tab_helper &&
+         previews_tab_helper->is_showing_offline_preview();
 }
 
 // static
 bool OfflinePageUtils::GetTabId(content::WebContents* web_contents,
                                 int* tab_id) {
   TabAndroid* tab_android = TabAndroid::FromWebContents(web_contents);
   if (!tab_android)
     return false;
   *tab_id = tab_android->GetAndroidId();
   return true;