Keep the GCM data intact when the user signs out of the profile

components/gcm_driver/gcm_driver_android.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_GCM_DRIVER_GCM_DRIVER_ANDROID_H
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_ANDROID_H
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 27 matching lines @@
                          jobjectArray data_keys_and_values);
   void OnMessagesDeleted(JNIEnv* env,
                          jobject obj,
                          jstring app_id);
 
   // Register JNI methods.
   static bool RegisterBindings(JNIEnv* env);
 
   // GCMDriver implementation:
   virtual void OnSignedIn() override;
+  virtual void OnSignedOut() override;
   virtual void Purge() override;
   virtual void Enable() override;
   virtual void AddConnectionObserver(GCMConnectionObserver* observer) override;
   virtual void RemoveConnectionObserver(
       GCMConnectionObserver* observer) override;
   virtual void Disable() override;
   virtual GCMClient* GetGCMClientForTesting() const override;
   virtual bool IsStarted() const override;
   virtual bool IsConnected() const override;
   virtual void GetGCMStatistics(const GetGCMStatisticsCallback& callback,
@@ skipping 19 matching lines @@
 
  private:
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriverAndroid);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_ANDROID_H