Implements an UpdateClient::SendUninstallPing API for the

components/update_client/update_client.cc

Index: components/update_client/update_client.cc
diff --git a/components/update_client/update_client.cc b/components/update_client/update_client.cc
index 05d8fbea03473afe46f5c40bbf8977d5a05feff7..60ac19a34fe3610202711242834c4ebe6de64640 100644
--- a/components/update_client/update_client.cc
+++ b/components/update_client/update_client.cc
@@ -226,6 +226,23 @@ void UpdateClientImpl::Stop() {
   }
 }
 
+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));