PNaCl on-demand installs: Make a separate async IPC to check if PNaCl is installed

chrome/browser/nacl_host/nacl_browser_delegate_impl.cc

 // Copyright 2013 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 "chrome/browser/nacl_host/nacl_browser_delegate_impl.h"
 
 #include "base/path_service.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/component_updater/pnacl/pnacl_component_installer.h"
 #include "chrome/browser/nacl_host/nacl_infobar_delegate.h"
 #include "chrome/browser/renderer_host/pepper/chrome_browser_pepper_host_factory.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_paths_internal.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/logging_chrome.h"
 #include "content/public/browser/browser_thread.h"
 #include "ppapi/c/private/ppb_nacl_private.h"
 
 void NaClBrowserDelegateImpl::ShowNaClInfobar(int render_process_id,
@@ skipping 31 matching lines @@
 }
 
 std::string NaClBrowserDelegateImpl::GetVersionString() const {
   return chrome::VersionInfo().CreateVersionString();
 }
 
 ppapi::host::HostFactory* NaClBrowserDelegateImpl::CreatePpapiHostFactory(
     content::BrowserPpapiHost* ppapi_host) {
   return new chrome::ChromeBrowserPepperHostFactory(ppapi_host);
 }
+
+void NaClBrowserDelegateImpl::TryInstallPnacl(
+    const base::Callback<void(bool)>& installed) {
+  ComponentUpdateService* cus = g_browser_process->component_updater();
+  PnaclComponentInstaller* pci =
+      g_browser_process->pnacl_component_installer();
+  if (cus && pci)
+    RequestFirstInstall(cus, pci, installed);
+  else
+    installed.Run(false);
+}