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

components/offline_pages/core/prefetch/prefetch_gcm_app_handler.cc

Index: components/offline_pages/core/prefetch/prefetch_gcm_app_handler.cc
diff --git a/components/offline_pages/core/prefetch/prefetch_gcm_app_handler.cc b/components/offline_pages/core/prefetch/prefetch_gcm_app_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..824e726406c6383880f01bc0283f491044929de9
--- /dev/null
+++ b/components/offline_pages/core/prefetch/prefetch_gcm_app_handler.cc
@@ -0,0 +1,65 @@
+// 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_gcm_app_handler.h"
+
+#include "base/memory/ptr_util.h"
+#include "components/offline_pages/core/prefetch/prefetch_service.h"
+
+namespace offline_pages {
+namespace {
+const char kPrefetchingOfflinePagesAppId[] =
+    "com.google.chrome.OfflinePagePrefetch";
+}
+
+// static
+void PrefetchGCMAppHandler::AddAppHandlerToPrefetchService(
+    PrefetchService* prefetch_service,
+    gcm::GCMProfileService* gcm_profile_service) {
+  if (!prefetch_service)
+    return;
+  PrefetchGCMAppHandler* prefetch_gcm_handler = new PrefetchGCMAppHandler();
+  gcm_profile_service->driver()->AddAppHandler(prefetch_gcm_handler->app_id(),
+                                               prefetch_gcm_handler);
+  prefetch_service->AddPrefetchGCMHandler(
+      base::WrapUnique(prefetch_gcm_handler));
+}
+
+PrefetchGCMAppHandler::PrefetchGCMAppHandler()
+    : app_id_(kPrefetchingOfflinePagesAppId) {}
+PrefetchGCMAppHandler::~PrefetchGCMAppHandler() = default;
+
+void PrefetchGCMAppHandler::ShutdownHandler() {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchGCMAppHandler::OnStoreReset() {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchGCMAppHandler::OnMessage(const std::string& app_id,
+                                      const gcm::IncomingMessage& message) {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchGCMAppHandler::OnMessagesDeleted(const std::string& app_id) {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchGCMAppHandler::OnSendError(
+    const std::string& app_id,
+    const gcm::GCMClient::SendErrorDetails& send_error_details) {
+  NOTIMPLEMENTED();
+}
+
+void PrefetchGCMAppHandler::OnSendAcknowledged(const std::string& app_id,
+                                               const std::string& message_id) {
+  NOTIMPLEMENTED();
+}
+
+bool PrefetchGCMAppHandler::CanHandle(const std::string& app_id) const {
+  return app_id == app_id_;
+}
+
+}  // namespace offline_pages