Push API: Validate storage before returning cached subscriptions

components/gcm_driver/gcm_driver_android.h

Index: components/gcm_driver/gcm_driver_android.h
diff --git a/components/gcm_driver/gcm_driver_android.h b/components/gcm_driver/gcm_driver_android.h
index ab5c9f3700aa1087c515270b70c4052e6c31856e..fb37f754ab32cb8796d549339820e429aeefa22a 100644
--- a/components/gcm_driver/gcm_driver_android.h
+++ b/components/gcm_driver/gcm_driver_android.h
@@ -8,6 +8,7 @@
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
+#include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ -54,6 +55,11 @@ class GCMDriverAndroid : public GCMDriver,
   static bool RegisterJni(JNIEnv* env);
 
   // GCMDriver implementation:
+  void ValidateRegistration(
+      const std::string& app_id,
+      const std::vector<std::string>& sender_ids,
+      const std::string& registration_id,
+      const ValidateRegistrationCallback& callback) override;
   void OnSignedIn() override;
   void OnSignedOut() override;
   void Enable() override;