Split Android-specific dependency from BackgroundLoaderOffliner. Create a subfolder of c/b/offline_…

chrome/browser/android/offline_pages/prerendering_offliner.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 "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/sys_info.h"
@@ skipping 260 matching lines @@
 
   // Post the cancel callback right after this call concludes.
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, *pending_request_.get()));
   GetOrCreateLoader()->StopLoading();
   pending_request_.reset(nullptr);
   app_listener_.reset(nullptr);
   return true;
 }
 
+void PrerenderingOffliner::TerminateLoadIfInProgress() {
+  // This is not implemented since this offliner is deprecated and

[dewittj, 2017/05/24 23:24:40]

Is this different behavior than we have today?

[Dmitry Titov, 2017/05/25 23:24:12]

No, it directly uses Android class. I hope we will remove this file before it'll
be necessary to refactor it as well.

+  // will be removed shortly.
+}
+
 bool PrerenderingOffliner::HandleTimeout(int64_t request_id) {
   if (pending_request_) {
     DCHECK(request_id == pending_request_->request_id());
     if (GetOrCreateLoader()->IsLowbarMet() &&
         (pending_request_->started_attempt_count() + 1 >=
              policy_->GetMaxStartedTries() ||
          pending_request_->completed_attempt_count() + 1 >=
              policy_->GetMaxCompletedTries())) {
       saved_on_last_retry_ = true;
       GetOrCreateLoader()->StartSnapshot();
@@ skipping 41 matching lines @@
           base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES) {
     DVLOG(1) << "App became active, canceling current offlining request";
     // No need to check the return value or complete early, as false would
     // indicate that there was no request, in which case the state change is
     // ignored.
     Cancel(
         base::Bind(HandleApplicationStateChangeCancel, completion_callback_));
   }
 }
 }  // namespace offline_pages