Support undoing offline page deletion

chrome/browser/android/offline_pages/offline_page_bridge.cc

 // 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.
 
 #include "chrome/browser/android/offline_pages/offline_page_bridge.h"
 
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
@@ skipping 76 matching lines @@
 void OfflinePageBridge::Destroy(JNIEnv*, jobject) {
   offline_page_model_->RemoveObserver(this);
   delete this;
 }
 
 void OfflinePageBridge::OfflinePageModelLoaded(OfflinePageModel* model) {
   DCHECK_EQ(offline_page_model_, model);
   NotifyIfDoneLoading();
 }
 
+void OfflinePageBridge::OfflinePageModelChanged(OfflinePageModel* model) {
+  DCHECK_EQ(offline_page_model_, model);
+  JNIEnv* env = base::android::AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> obj = weak_java_ref_.get(env);
+  if (obj.is_null())
+    return;
+  Java_OfflinePageBridge_offlinePageModelChanged(env, obj.obj());
+}
+
 void OfflinePageBridge::GetAllPages(JNIEnv* env,
                                     jobject obj,
                                     jobject j_result_obj) {
   DCHECK(offline_page_model_->is_loaded());
   DCHECK(j_result_obj);
   const std::vector<OfflinePageItem>& offline_pages =
       offline_page_model_->GetAllPages();
   ToJavaOfflinePageList(env, j_result_obj, offline_pages);
 }
 
@@ skipping 124 matching lines @@
   return reinterpret_cast<jlong>(new OfflinePageBridge(
       env, obj, ProfileAndroid::FromProfileAndroid(j_profile)));
 }
 
 bool RegisterOfflinePageBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace offline_pages