Implement OfflinePageDownloadBridge::startDownload

chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.h

 // Copyright 2016 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_DOWNLOADS_OFFLINE_PAGE_DOWNLOAD_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_DOWNLOADS_OFFLINE_PAGE_DOWNLOAD_BRIDGE_H_
 
 #include <stdint.h>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "base/supports_user_data.h"
 #include "components/offline_pages/downloads/download_ui_adapter.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace offline_pages {
 namespace android {
 
 /**
  * Bridge between C++ and Java for exposing native implementation of offline
  * pages model in managed code.
  */
 class OfflinePageDownloadBridge : public DownloadUIAdapter::Observer {
  public:
   OfflinePageDownloadBridge(JNIEnv* env,
                             const base::android::JavaParamRef<jobject>& obj,
                             DownloadUIAdapter* download_ui_adapter);
   ~OfflinePageDownloadBridge() override;
 
   static bool Register(JNIEnv* env);
 
-  void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
+  void Destroy(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
 
-  void GetAllItems(JNIEnv* env,
-                   const base::android::JavaParamRef<jobject>& obj,
-                   const base::android::JavaParamRef<jobject>& j_result_obj);
+  void GetAllItems(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      const base::android::JavaParamRef<jobject>& j_result_obj);
 
   base::android::ScopedJavaLocalRef<jobject> GetItemByGuid(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       const base::android::JavaParamRef<jstring>& j_guid);
 
-  void DeleteItemByGuid(JNIEnv* env,
-                        const base::android::JavaParamRef<jobject>& obj,
-                        const base::android::JavaParamRef<jstring>& j_guid);
+  void DeleteItemByGuid(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      const base::android::JavaParamRef<jstring>& j_guid);
 
   base::android::ScopedJavaLocalRef<jstring> GetOfflineUrlByGuid(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       const base::android::JavaParamRef<jstring>& j_guid);
 
+  void StartDownload(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj,
+      const base::android::JavaParamRef<jobject>& j_tab);
+
   // DownloadUIAdapter::Observer implementation.
   void ItemsLoaded() override;
   void ItemAdded(const DownloadUIItem& item) override;
   void ItemUpdated(const DownloadUIItem& item) override;
   void ItemDeleted(const std::string& guid) override;
 
  private:
+  void SavePageCallback(OfflinePageModel::SavePageResult result,
+                        int64_t offline_id);
+
   JavaObjectWeakGlobalRef weak_java_ref_;
-
   // Not owned.
   DownloadUIAdapter* download_ui_adapter_;
 
+  base::WeakPtrFactory<OfflinePageDownloadBridge> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(OfflinePageDownloadBridge);
 };
 
 }  // namespace android
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_DOWNLOADS_OFFLINE_PAGE_DOWNLOAD_BRIDGE_H_