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

components/offline_pages/core/prefetch/prefetch_service_impl.cc

Index: components/offline_pages/core/prefetch/prefetch_service_impl.cc
diff --git a/components/offline_pages/core/prefetch/prefetch_service_impl.cc b/components/offline_pages/core/prefetch/prefetch_service_impl.cc
index 13f0eb3f40502706ad1a1fe7f2d6503c5f811f87..abdaffd548d4744960b65c83e7a827ef128b1971 100644
--- a/components/offline_pages/core/prefetch/prefetch_service_impl.cc
+++ b/components/offline_pages/core/prefetch/prefetch_service_impl.cc
@@ -3,8 +3,42 @@
 // 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;
@@ -32,6 +66,10 @@ 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