Have the RequestCoordinator generate the offline_id

chrome/browser/android/offline_pages/prerendering_offliner_unittest.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/prerendering_offliner.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/run_loop.h"
@@ skipping 86 matching lines @@
 };
 
 // Mock OfflinePageModel for testing the SavePage calls.
 class MockOfflinePageModel : public StubOfflinePageModel {
  public:
   MockOfflinePageModel() : mock_saving_(false) {}
   ~MockOfflinePageModel() override {}
 
   void SavePage(const GURL& url,
                 const ClientId& client_id,
+                int64_t proposed_offline_id,
                 std::unique_ptr<OfflinePageArchiver> archiver,
                 const SavePageCallback& callback) override {
     mock_saving_ = true;
     save_page_callback_ = callback;
   }
 
   void CompleteSavingAsArchiveCreationFailed() {
     DCHECK(mock_saving_);
     mock_saving_ = false;
     base::ThreadTaskRunnerHandle::Get()->PostTask(
@@ skipping 248 matching lines @@
   EXPECT_FALSE(loader()->IsIdle());
 
   offliner()->SetApplicationStateForTesting(
       base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES);
 
   // Loader still loading since not low-end device.
   EXPECT_FALSE(loader()->IsIdle());
 }
 
 }  // namespace offline_pages