Add LaunchSelLdr and UrandomFD to PPAPI

LaunchSelLdr just calls through to the webkit_glue backend, which calls through a bunch more layers of abstraction for us.

UrandomFD returns the file descriptor of /dev/urandom (on Posix), which NaCl uses for some purpose by can't get directly because of the sandbox.
Review URL: http://codereview.chromium.org/6023003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69578 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/c/private/ppb_nacl_util_private.h

@@ -11,7 +11,19 @@
 #define PPB_NACLUTIL_PRIVATE_INTERFACE "PPB_NaClUtil(Private);0.1"
 
 struct PPB_NaClUtil_Private {
-  int32_t (*LaunchSelLdr)(PP_Resource file_io);
+  // This function launches NaCl's sel_ldr process.  On success, the function
+  // returns true, otherwise it returns false.  When it returns true, it will
+  // write |socket_count| nacl::Handles to imc_handles and will write the
+  // nacl::Handle of the created process to |nacl_process_handle|.  Finally,
+  // the function will write the process ID of the created process to
+  // |nacl_process_id|.
+  bool (*LaunchSelLdr)(const char* alleged_url, int socket_count,
+                       void* imc_handles, void* nacl_process_handle,
+                       int* nacl_process_id);
+
+  // On POSIX systems, this function returns the file descriptor of
+  // /dev/urandom.  On non-POSIX systems, this function returns 0.
+  int (*UrandomFD)(void);
 };
 
 #endif  // PPAPI_C_PRIVATE_PPB_NACL_UTIL_PRIVATE_H_

webkit/plugins/ppapi/ppb_nacl_util_private_impl.cc

@@ -4,21 +4,35 @@
 
 #include "webkit/plugins/ppapi/ppb_nacl_util_private_impl.h"
 
+#include "base/rand_util_c.h"
 #include "ppapi/c/private/ppb_nacl_util_private.h"
+#include "webkit/glue/webkit_glue.h"
 
 namespace webkit {
 namespace ppapi {
 
 namespace {
 
-int32_t LaunchSelLdr(PP_Resource file_io) {
+bool LaunchSelLdr(const char* alleged_url, int socket_count,
+                  void* imc_handles, void* nacl_process_handle,
+                  int* nacl_process_id) {
+  return webkit_glue::LaunchSelLdr(alleged_url, socket_count, imc_handles,
+                                   nacl_process_handle, nacl_process_id);
+}
+
+int UrandomFD(void) {
+#if defined(OS_POSIX)
+  return GetUrandomFD();
+#else
   return 0;
+#endif
 }
 
 }  // namespace
 
 const PPB_NaClUtil_Private ppb_nacl_util = {
   &LaunchSelLdr,
+  &UrandomFD,
 };
 
 // static