Use service process to collect printers.

chrome/service/service_ipc_server.cc

Index: chrome/service/service_ipc_server.cc
diff --git a/chrome/service/service_ipc_server.cc b/chrome/service/service_ipc_server.cc
index b700c57e0369e27f07883313bf96cdf28fcbf8fd..987f8060fd6cde8f3814353eed47dd13c1043a17 100644
--- a/chrome/service/service_ipc_server.cc
+++ b/chrome/service/service_ipc_server.cc
@@ -100,6 +100,7 @@ bool ServiceIPCServer::OnMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(ServiceMsg_GetCloudPrintProxyInfo,
                         OnGetCloudPrintProxyInfo)
     IPC_MESSAGE_HANDLER(ServiceMsg_GetHistograms, OnGetHistograms)
+    IPC_MESSAGE_HANDLER(ServiceMsg_GetPrinters, OnGetPrinters)
     IPC_MESSAGE_HANDLER(ServiceMsg_Shutdown, OnShutdown);
     IPC_MESSAGE_HANDLER(ServiceMsg_UpdateAvailable, OnUpdateAvailable);
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -132,6 +133,12 @@ void ServiceIPCServer::OnGetHistograms() {
   channel_->Send(new ServiceHostMsg_Histograms(deltas));
 }
 
+void ServiceIPCServer::OnGetPrinters() {
+  std::vector<std::string> printers;
+  g_service_process->GetCloudPrintProxy()->GetPrinters(&printers);
+  channel_->Send(new ServiceHostMsg_Printers(printers));
+}
+
 void ServiceIPCServer::OnDisableCloudPrintProxy() {
   // User disabled CloudPrint proxy explicitly. Delete printers
   // registered from this proxy and disable proxy.