Support undoing offline page deletion

chrome/browser/android/offline_pages/offline_page_bridge.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_BRIDGE_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "components/offline_pages/offline_page_model.h"
@@ skipping 18 matching lines @@
   // Returns true if |url| might points to an offline page.
   static bool MightBeOfflineURL(const GURL& url);
 
   OfflinePageBridge(JNIEnv* env,
                     jobject obj,
                     content::BrowserContext* browser_context);
   void Destroy(JNIEnv*, jobject);
 
   // OfflinePageModel::Observer implementation.
   void OfflinePageModelLoaded(OfflinePageModel* model) override;
+  void OfflinePageModelChanged(OfflinePageModel* model) override;
 
   void GetAllPages(JNIEnv* env,
                    jobject obj,
                    jobject j_result_obj);
   void GetPagesToCleanUp(JNIEnv* env, jobject obj, jobject j_result_obj);
 
   base::android::ScopedJavaLocalRef<jobject>
   GetPageByBookmarkId(JNIEnv* env, jobject obj, jlong bookmark_id);
 
   void SavePage(JNIEnv* env,
@@ skipping 29 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(OfflinePageBridge);
 };
 
 bool RegisterOfflinePageBridge(JNIEnv* env);
 
 }  // namespace android
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_OFFLINE_PAGE_BRIDGE_H_