Show GAIA/cookie accounts on the signin-internals page.

components/signin/core/browser/test_signin_client.cc

Index: components/signin/core/browser/test_signin_client.cc
diff --git a/components/signin/core/browser/test_signin_client.cc b/components/signin/core/browser/test_signin_client.cc
index d05c65b58fda15cee3e4aa4cae95d572ec7136ad..4b62c719193ad9fa32efcdc4bfed5e95c82a6043 100644
--- a/components/signin/core/browser/test_signin_client.cc
+++ b/components/signin/core/browser/test_signin_client.cc
@@ -74,8 +74,11 @@ bool TestSigninClient::ShouldMergeSigninCredentialsIntoCookieJar() {
   return true;
 }
 
-void TestSigninClient::SetCookieChangedCallback(
-    const CookieChangedCallback& callback) {}
+scoped_ptr<SigninClient::CookieChangedCallbackList::Subscription>
+TestSigninClient::AddCookieChangedCallback(
+    const SigninClient::CookieChangedCallback& callback) {
+  return cookie_callbacks_.Add(callback);
+}
 
 #if defined(OS_IOS)
 ios::ProfileOAuth2TokenServiceIOSProvider* TestSigninClient::GetIOSProvider() {