[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..e6baf087cb0821fa7ce3c183617dce6bbb376d30
--- /dev/null
+++ b/components/offline_pages/core/prefetch/prefetch_gcm_app_handler.cc
@@ -0,0 +1,59 @@
+// 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";
+}
+
+PrefetchGCMAppHandler::PrefetchGCMAppHandler() {}
+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 == GetAppId();
+}
+
+gcm::GCMAppHandler* PrefetchGCMAppHandler::AsGCMAppHandler() {
+  return (gcm::GCMAppHandler*)this;
+}
+
+std::string PrefetchGCMAppHandler::GetAppId() const {
+  return kPrefetchingOfflinePagesAppId;
+}
+
+}  // namespace offline_pages