Open NaCl IRT file only once at startup

chrome/browser/nacl_host/nacl_process_host.h

 // Copyright (c) 2011 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 CHROME_BROWSER_NACL_HOST_NACL_PROCESS_HOST_H_
 #define CHROME_BROWSER_NACL_HOST_NACL_PROCESS_HOST_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 10 matching lines @@
 // channel. There will be one NaClProcessHost per NaCl process
 // The browser is responsible for starting the NaCl process
 // when requested by the renderer.
 // After that, most of the communication is directly between NaCl plugin
 // running in the renderer and NaCl processes.
 class NaClProcessHost : public BrowserChildProcessHost {
  public:
   explicit NaClProcessHost(const std::wstring& url);
   virtual ~NaClProcessHost();
 
+  // Open the integrated runtime library file and save it for later.
+  static void OpenIrtLibraryFile();
+
   // Initialize the new NaCl process, returning true on success.
   bool Launch(ChromeRenderMessageFilter* chrome_render_message_filter,
               int socket_count,
               IPC::Message* reply_msg);
 
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   void OnProcessLaunchedByBroker(base::ProcessHandle handle);
 
  protected:
   virtual base::TerminationStatus GetChildTerminationStatus(int* exit_code);
   virtual void OnChildDied();
 
  private:
   // Internal class that holds the nacl::Handle objecs so that
   // nacl_process_host.h doesn't include NaCl headers.  Needed since it's
   // included by src\content, which can't depend on the NaCl gyp file because it
   // depends on chrome.gyp (circular dependency).
   struct NaClInternal;
 
   bool LaunchSelLdr();
 
-  // Get the architecture-specific filename of NaCl's integrated
-  // runtime (IRT) library, relative to the plugins directory.
-  FilePath::StringType GetIrtLibraryFilename();
-
   virtual void OnProcessLaunched();
 
-  void OpenIrtFileDone(base::PlatformFileError error_code,
-                       base::PassPlatformFile file,
-                       bool created);
+  void SendStart(base::PlatformFile irt_file);
 
   virtual bool CanShutdown();
 
+  static bool RunningOnWOW64();
+
  private:
+  static base::PlatformFile irt_platform_file_;
+
   // The ChromeRenderMessageFilter that requested this NaCl process.  We use
   // this for sending the reply once the process has started.
   scoped_refptr<ChromeRenderMessageFilter> chrome_render_message_filter_;
 
   // The reply message to send.
   IPC::Message* reply_msg_;
 
   // Socket pairs for the NaCl process and renderer.
   scoped_ptr<NaClInternal> internal_;
 
-  // Windows platform flag
-  bool running_on_wow64_;
-
   base::WeakPtrFactory<NaClProcessHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClProcessHost);
 };
 
 #endif  // CHROME_BROWSER_NACL_HOST_NACL_PROCESS_HOST_H_