Showing previews UI for Offline Previews

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 33718c4c676eef81cfe73b9bed3c39cf3714fb4c..ee2f206288d71dfddfeb6af28ed552837d494d95 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -813,20 +813,26 @@ void TabAndroid::ShowOfflinePages() {
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_Tab_showOfflinePages(env, weak_java_tab_.get(env));
 }
 
 jboolean TabAndroid::IsOfflinePage(JNIEnv* env,
                                    const JavaParamRef<jobject>& obj) {
   return offline_pages::OfflinePageUtils::GetOfflinePageFromWebContents(
       web_contents()) != nullptr;
 }
 
+jboolean TabAndroid::IsShowingOfflinePreview(JNIEnv* env,
+                                             const JavaParamRef<jobject>& obj) {
+  return offline_pages::OfflinePageUtils::IsShowingOfflinePreview(
+      web_contents());
+}
+
 ScopedJavaLocalRef<jobject> TabAndroid::GetOfflinePage(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj) {
   const offline_pages::OfflinePageItem* offline_page =
       offline_pages::OfflinePageUtils::GetOfflinePageFromWebContents(
           web_contents());
   if (!offline_page)
     return ScopedJavaLocalRef<jobject>();
 
   return offline_pages::android::OfflinePageBridge::ConvertToJavaOfflinePage(