Support serving offline page by offline ID

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

 // 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.
 
 #include "chrome/browser/android/offline_pages/downloads/offline_page_download_bridge.h"
 
 #include <vector>
 
 #include "base/android/jni_string.h"
 #include "base/bind.h"
@@ skipping 173 matching lines @@
 }
 
 void OfflinePageDownloadBridge::DeleteItemByGuid(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj,
     const JavaParamRef<jstring>& j_guid) {
   std::string guid = ConvertJavaStringToUTF8(env, j_guid);
   download_ui_adapter_->DeleteItem(guid);
 }
 
-ScopedJavaLocalRef<jstring> OfflinePageDownloadBridge::GetOfflineUrlByGuid(
+jlong OfflinePageDownloadBridge::GetOfflineIdByGuid(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj,
     const JavaParamRef<jstring>& j_guid) {
   std::string guid = ConvertJavaStringToUTF8(env, j_guid);
-  GURL url = download_ui_adapter_->GetOfflineUrlByGuid(guid);
-  if (!url.is_valid())
-    return ScopedJavaLocalRef<jstring>();
-  return ConvertUTF8ToJavaString(env, url.spec());
+  return download_ui_adapter_->GetOfflineIdByGuid(guid);
 }
 
 void OfflinePageDownloadBridge::StartDownload(
     JNIEnv* env,
     const JavaParamRef<jobject>& obj,
     const JavaParamRef<jobject>& j_tab) {
   TabAndroid* tab = TabAndroid::GetNativeTab(env, j_tab);
   if (!tab)
     return;
 
@@ skipping 139 matching lines @@
 
   DownloadUIAdapter* adapter =
       DownloadUIAdapter::FromOfflinePageModel(offline_page_model);
 
   return reinterpret_cast<jlong>(
       new OfflinePageDownloadBridge(env, obj, adapter, browser_context));
 }
 
 }  // namespace android
 }  // namespace offline_pages