Add a NaCl-Private interface for opening files in DIR_PNACL_COMPONENT.

chrome/renderer/pepper/ppb_nacl_private_impl.cc

Index: chrome/renderer/pepper/ppb_nacl_private_impl.cc
diff --git a/chrome/renderer/pepper/ppb_nacl_private_impl.cc b/chrome/renderer/pepper/ppb_nacl_private_impl.cc
index 2e9b494ef03c6edbbc61bfeec26ac330a9079b57..b8667f9e57a0ea0a31e922fec0510fb34926d638 100644
--- a/chrome/renderer/pepper/ppb_nacl_private_impl.cc
+++ b/chrome/renderer/pepper/ppb_nacl_private_impl.cc
@@ -33,6 +33,11 @@
 #include "webkit/plugins/ppapi/plugin_module.h"
 #include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
 
+#if defined(OS_WIN)
+#include <fcntl.h>
+#include <io.h>
+#endif
+
 using content::RenderThread;
 using content::RenderView;
 using webkit::ppapi::HostGlobals;
@@ -257,6 +262,40 @@ int BrokerDuplicateHandle(void* source_handle,
 #endif
 }
 
+int GetReadonlyPnaclFD(const char* filename) {
+  IPC::PlatformFileForTransit out_fd = IPC::InvalidPlatformFileForTransit();
+  IPC::Sender* sender = content::RenderThread::Get();
+  if (sender == NULL)
+    sender = g_background_thread_sender.Pointer()->get();
+
+  if (!sender->Send(new ChromeViewHostMsg_GetReadonlyPnaclFD(
+          std::string(filename),
+          &out_fd))) {
+    return -1;
+  }
+
+  if (out_fd == IPC::InvalidPlatformFileForTransit()) {
+    return -1;
+  }
+
+  base::PlatformFile handle = IPC::PlatformFileForTransitToPlatformFile(
+      out_fd);
+#if defined(OS_WIN)
+  int posix_desc = _open_osfhandle(reinterpret_cast<intptr_t>(handle),
+                                   _O_RDONLY | _O_BINARY);
+  if (posix_desc == -1) {
+    // Close the Windows HANDLE if it can't be converted.
+    CloseHandle(handle);
+    return -1;
+  }
+  return posix_desc;
+#elif defined(OS_POSIX)
+  return handle;
+#else
+#error "GetReadonlyPnaclFD: Don't know how to convert FileDescriptor to native."
+#endif
+}
+
 const PPB_NaCl_Private nacl_interface = {
   &LaunchSelLdr,
   &StartPpapiProxy,
@@ -264,6 +303,7 @@ const PPB_NaCl_Private nacl_interface = {
   &Are3DInterfacesDisabled,
   &EnableBackgroundSelLdrLaunch,
   &BrokerDuplicateHandle,
+  &GetReadonlyPnaclFD
 };
 
 }  // namespace