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

ppapi/native_client/src/trusted/plugin/pnacl_coordinator.h

 // Copyright (c) 2012 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.
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_
 
 #include <set>
 #include <map>
 #include <vector>
@@ skipping 130 matching lines @@
  private:
   NACL_DISALLOW_COPY_AND_ASSIGN(PnaclCoordinator);
 
   // BitcodeToNative is the factory method for PnaclCoordinators.
   // Therefore the constructor is private.
   PnaclCoordinator(Plugin* plugin,
                    const nacl::string& pexe_url,
                    const PnaclOptions& pnacl_options,
                    const pp::CompletionCallback& translate_notify_callback);
 
+  // Callback for when we know PNaCl is installed.
+  void DidCheckPnaclInstalled(int32_t pp_error);
+
   // Callback for when the resource info JSON file has been read.
   void ResourceInfoWasRead(int32_t pp_error);
 
   // Callback for when llc and ld have been downloaded.
   void ResourcesDidLoad(int32_t pp_error);
 
   // Callbacks for temporary file related stages.
   // They are invoked from ResourcesDidLoad and proceed in declaration order.
   // Invoked when the temporary file system is successfully opened in PPAPI.
   void FileSystemDidOpen(int32_t pp_error);
@@ skipping 114 matching lines @@
   // The helper thread used to do translations via SRPC.
   // Keep this last in declaration order to ensure the other variables
   // haven't been destroyed yet when its destructor runs.
   nacl::scoped_ptr<PnaclTranslateThread> translate_thread_;
 };
 
 //----------------------------------------------------------------------
 
 }  // namespace plugin;
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PNACL_COORDINATOR_H_