[Offline Pages] Add a GCMAppHandler for offline page prefetch.

components/offline_pages/core/prefetch/prefetch_service_impl.cc

 // Copyright 2017 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 "components/offline_pages/core/prefetch/prefetch_service_impl.h"
+#include "components/gcm_driver/gcm_driver.h"
 
 namespace offline_pages {
+namespace {
+const char kPrefetchingOfflinePagesAppId[] =
+    "com.google.chrome.OfflinePagePrefetch";
+}
+
+void PrefetchServiceImpl::PrefetchServiceAppHandler::ShutdownHandler() {}
+
+void PrefetchServiceImpl::PrefetchServiceAppHandler::OnStoreReset() {}
+
+void PrefetchServiceImpl::PrefetchServiceAppHandler::OnMessage(
+    const std::string& app_id,
+    const gcm::IncomingMessage& message) {
+  DVLOG(1) << "PrefetchServiceImpl " << __func__ << ":" << message.raw_data;
+}
+
+void PrefetchServiceImpl::PrefetchServiceAppHandler::OnMessagesDeleted(
+    const std::string& app_id) {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchServiceImpl::PrefetchServiceAppHandler::OnSendError(
+    const std::string& app_id,
+    const gcm::GCMClient::SendErrorDetails& send_error_details) {
+  // We should never get here, since we are not sending GCM upstream.
+  NOTREACHED();
+}
+
+void PrefetchServiceImpl::PrefetchServiceAppHandler::OnSendAcknowledged(
+    const std::string& app_id,
+    const std::string& message_id) {
+  // We should never get here, since we are not sending GCM upstream.
+  NOTREACHED();
+}
 
 PrefetchServiceImpl::PrefetchServiceImpl() {}
 PrefetchServiceImpl::~PrefetchServiceImpl() = default;
 
 void PrefetchServiceImpl::AddCandidatePrefetchURLs(
     const std::vector<PrefetchURL>& url_suggestions) {
   NOTIMPLEMENTED();
 }
 void PrefetchServiceImpl::RemoveAllUnprocessedPrefetchURLs(
     const std::string& name_space) {
   NOTIMPLEMENTED();
 }
 
 void PrefetchServiceImpl::RemovePrefetchURLsByClientId(
     const ClientId& client_id) {
   NOTIMPLEMENTED();
 }
 
 void PrefetchServiceImpl::BeginBackgroundTask(
     std::unique_ptr<ScopedBackgroundTask> task) {
   NOTIMPLEMENTED();
 }
 
 void PrefetchServiceImpl::StopBackgroundTask(ScopedBackgroundTask* task) {
   NOTIMPLEMENTED();
 }
 
+void PrefetchServiceImpl::RegisterWithGCMDriver(gcm::GCMDriver* driver) {
+  driver->AddAppHandler(kPrefetchingOfflinePagesAppId, &app_handler_);

[Dmitry Titov, 2017/05/11 03:35:20]

If you do this in the GCMProfileServiceFactory, you would avoid making
offline_pages DEPS for GCMDriver.

+}
+
 void PrefetchServiceImpl::Shutdown() {}
 
 }  // namespace offline_pages