Implements an UpdateClient::SendUninstallPing API for the

components/update_client/update_client.cc

 // 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.
 
 #include "components/update_client/update_client.h"
 
 #include <algorithm>
 #include <queue>
 #include <set>
 #include <utility>
@@ skipping 208 matching lines @@
   // Cancel the pending tasks. These tasks are safe to cancel and delete since
   // they have not picked up by the update engine, and not shared with any
   // task runner yet.
   while (!task_queue_.empty()) {
     const auto task(task_queue_.front());
     task_queue_.pop();
     task->Cancel();
   }
 }
 
+void UpdateClientImpl::SendUninstallPing(const std::string& id,
+                                         const Version& version,
+                                         int reason) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // The implementation of PingManager::SendPing contains a self-deleting
+  // object responsible for sending the ping.
+  CrxUpdateItem item;
+  item.state = CrxUpdateItem::State::kUninstalled;
+  item.id = id;
+  item.previous_version = version;
+  item.next_version = base::Version("0");
+  item.error_code = reason;

[waffles, 2016/01/12 02:26:38]

I'm not sure about overloading error_code to be the uninstall reason. asargent@:
Do we need to transmit the uninstall reason?
If so, I would rather use extracode1.

[Sorin Jianu, 2016/01/12 03:24:06]

Done.

[asargent_no_longer_on_chrome, 2016/01/14 21:57:53]

Just to confirm, yes, we do want to be able to send an uninstall reason.

+
+  ping_manager_->SendPing(&item);
+}
+
 scoped_refptr<UpdateClient> UpdateClientFactory(
     const scoped_refptr<Configurator>& config) {
   scoped_ptr<PingManager> ping_manager(new PingManager(config));
   return new UpdateClientImpl(config, std::move(ping_manager),
                               &UpdateChecker::Create, &CrxDownloader::Create);
 }
 
 }  // namespace update_client