Persist Instance ID data to GCM store.

components/gcm_driver/instance_id/instance_id_android.cc

Index: components/gcm_driver/instance_id/instance_id_android.cc
diff --git a/components/gcm_driver/instance_id/instance_id_android.cc b/components/gcm_driver/instance_id/instance_id_android.cc
index 2057a814624735ced53a4c66d0687699be55bcc8..9e7a1640422cbe24cf252fdcbcc2d4a927f81c84 100644
--- a/components/gcm_driver/instance_id/instance_id_android.cc
+++ b/components/gcm_driver/instance_id/instance_id_android.cc
@@ -21,14 +21,13 @@ InstanceIDAndroid::InstanceIDAndroid(const std::string& app_id)
 InstanceIDAndroid::~InstanceIDAndroid() {
 }
 
-std::string InstanceIDAndroid::GetID() {
+void InstanceIDAndroid::GetID(const GetIDCallback& callback) {
   NOTIMPLEMENTED();
-  return std::string();
 }
 
-base::Time InstanceIDAndroid::GetCreationTime() {
+void InstanceIDAndroid::GetCreationTime(
+    const GetCreationTimeCallback& callback) {
   NOTIMPLEMENTED();
-  return base::Time();
 }
 
 void InstanceIDAndroid::GetToken(