Push API: Validate storage before returning cached subscriptions

components/gcm_driver/fake_gcm_driver.cc

Index: components/gcm_driver/fake_gcm_driver.cc
diff --git a/components/gcm_driver/fake_gcm_driver.cc b/components/gcm_driver/fake_gcm_driver.cc
index 6f4e5d863dade39fc64c50cd4d44bdfee4135d1d..9974f92bfc45a0c03179fc0ea71ca53a737ef8bd 100644
--- a/components/gcm_driver/fake_gcm_driver.cc
+++ b/components/gcm_driver/fake_gcm_driver.cc
@@ -4,8 +4,10 @@
 
 #include "components/gcm_driver/fake_gcm_driver.h"
 
+#include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/sequenced_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 
 namespace gcm {
 
@@ -20,6 +22,15 @@ FakeGCMDriver::FakeGCMDriver(
 FakeGCMDriver::~FakeGCMDriver() {
 }
 
+void FakeGCMDriver::ValidateRegistration(
+    const std::string& app_id,
+    const std::vector<std::string>& sender_ids,
+    const std::string& registration_id,
+    const ValidateRegistrationCallback& callback) {
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(callback, true /* is_valid */));
+}
+
 void FakeGCMDriver::OnSignedIn() {
 }