Provide method to store user's picture

Thanks @slivorezka

I can't apply the patch. I get

Checking patch SocialAuthUserManager.php...
error: SocialAuthUserManager.php: No such file or directory

Thanks @slivorezka

1. +++ b/src/SocialAuthUserManager.php
   @@ -27,11 +38,28 @@ class SocialAuthUserManager {
   +    $this->eventDispatcher    = $event_dispatcher;
   

   The event dispatcher is not being used anywhere.

2. +++ b/src/SocialAuthUserManager.php
   @@ -247,4 +275,143 @@ class SocialAuthUserManager {
   +  protected function downloadProfilePic($picture_url, $id) {
   +    // Make sure that we have everything we need.
   +    if (!$picture_url || !$id) {
   

   This method should be generic. Why is it the id a parameter? I guess It should only receive an url or we should find a different way to generate the file name. Maybe a facebook account has the id 1234, but another Google account also has the id 1234.

Thanks again.

1. +++ b/src/SocialAuthUserManager.php
   @@ -27,11 +37,25 @@ class SocialAuthUserManager {
   -  public function __construct(ConfigFactoryInterface $config_factory, LoggerChannelFactoryInterface $logger_factory, EntityTypeManagerInterface $entity_type_manager) {
   

   You have included new arguments in the construct method, but the service definition hasn't been updated in social_auth.services.yml

2. +++ b/src/SocialAuthUserManager.php
   @@ -247,4 +271,147 @@ class SocialAuthUserManager {
   +        ->error('Could not download Twitter profile picture from url: @url', array('@url' => $picture_url));
   

   Maybe we can use the provider argument to create this message.

Because of #2843056: Provide on login and create user event dispatchers, this patch can not longer be applied.

index 99e334f..66fd708 100644
--- a/README.txt

--- a/README.txt
+++ b/README.txt

+++ b/README.txt
@@ -1,15 +1,24 @@

@@ -1,15 +1,24 @@
 INTRODUCTION
 ------------

Changes to README file have also been added here

Committed with some changes. Thanks everyone.

We need to add this to Social Auth Example, as well as to all implementers in drupal.org

Just committed the changes to Social Auth Examples. Only implementers are missing, but that's not part of this issue.