[sync] Sign user out of Chrome on dashboard stop and reset

chrome/browser/android/signin/signin_manager_android.cc

Index: chrome/browser/android/signin/signin_manager_android.cc
diff --git a/chrome/browser/android/signin/signin_manager_android.cc b/chrome/browser/android/signin/signin_manager_android.cc
index 233fa412fa86ff71681401ea2e498a6416f6f4fc..b20d62707da9b0cf7b95d1b35876e05faf912a56 100644
--- a/chrome/browser/android/signin/signin_manager_android.cc
+++ b/chrome/browser/android/signin/signin_manager_android.cc
@@ -86,6 +86,7 @@ SigninManagerAndroid::SigninManagerAndroid(JNIEnv* env, jobject obj)
   java_signin_manager_.Reset(env, obj);
   profile_ = ProfileManager::GetActiveUserProfile();
   DCHECK(profile_);
+  SigninManagerFactory::GetForProfile(profile_)->AddObserver(this);
   pref_change_registrar_.Init(profile_->GetPrefs());
   pref_change_registrar_.Add(
       prefs::kSigninAllowed,
@@ -269,6 +270,19 @@ jboolean SigninManagerAndroid::IsSignedInOnNative(
   return SigninManagerFactory::GetForProfile(profile_)->IsAuthenticated();
 }
 
+void SigninManagerAndroid::GoogleSigninFailed(
+    const GoogleServiceAuthError& error) {}
+
+void SigninManagerAndroid::GoogleSigninSucceeded(const std::string& account_id,
+                                                 const std::string& username,
+                                                 const std::string& password) {}
+
+void SigninManagerAndroid::GoogleSignedOut(const std::string& account_id,
+                                           const std::string& username) {
+  Java_SigninManager_onNativeSignOut(base::android::AttachCurrentThread(),
+                                     java_signin_manager_.obj());
+}
+
 void SigninManagerAndroid::OnSigninAllowedPrefChanged() {
   Java_SigninManager_onSigninAllowedByPolicyChanged(
       base::android::AttachCurrentThread(), java_signin_manager_.obj(),