Open NaCl IRT file only once at startup

chrome/browser/nacl_host/nacl_process_host.h

Index: chrome/browser/nacl_host/nacl_process_host.h
diff --git a/chrome/browser/nacl_host/nacl_process_host.h b/chrome/browser/nacl_host/nacl_process_host.h
index 59f4f50730e615aaf54f2bccc34ebef26c6bdb22..fe065209ffd462795866a1d5aec00042c5c61d5a 100644
--- a/chrome/browser/nacl_host/nacl_process_host.h
+++ b/chrome/browser/nacl_host/nacl_process_host.h
@@ -28,6 +28,9 @@ class NaClProcessHost : public BrowserChildProcessHost {
   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,
@@ -50,19 +53,17 @@ class NaClProcessHost : public BrowserChildProcessHost {
 
   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_;
@@ -73,9 +74,6 @@ class NaClProcessHost : public BrowserChildProcessHost {
   // 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);