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

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 4d918991a80114798958f78334ab9cfb30d767f4..d65cd3ecfd938f2c5162da4e8b24b13f3a9d8623 100644
--- a/chrome/renderer/pepper/ppb_nacl_private_impl.cc
+++ b/chrome/renderer/pepper/ppb_nacl_private_impl.cc
@@ -220,6 +220,19 @@ int32_t BrokerDuplicateHandle(PP_FileHandle source_handle,
 #endif
 }
 
+int32_t EnsurePnaclInstalled(PP_Instance instance,
+                             PP_CompletionCallback callback) {
+  ppapi::thunk::EnterInstance enter(instance, callback);
+  if (enter.failed())
+    return enter.retval();
+  if (!InitializePnaclResourceHost())
+    return enter.SetResult(PP_ERROR_FAILED);
+  g_pnacl_resource_host.Get()->EnsurePnaclInstalled(
+      instance,
+      enter.callback());
+  return enter.SetResult(PP_OK_COMPLETIONPENDING);
+}
+
 PP_FileHandle GetReadonlyPnaclFD(const char* filename) {
   IPC::PlatformFileForTransit out_fd = IPC::InvalidPlatformFileForTransit();
   IPC::Sender* sender = content::RenderThread::Get();
@@ -229,11 +242,9 @@ PP_FileHandle GetReadonlyPnaclFD(const char* filename) {
           &out_fd))) {
     return base::kInvalidPlatformFileValue;
   }
-
   if (out_fd == IPC::InvalidPlatformFileForTransit()) {
     return base::kInvalidPlatformFileValue;
   }
-
   base::PlatformFile handle =
       IPC::PlatformFileForTransitToPlatformFile(out_fd);
   return handle;
@@ -365,6 +376,7 @@ const PPB_NaCl_Private nacl_interface = {
   &UrandomFD,
   &Are3DInterfacesDisabled,
   &BrokerDuplicateHandle,
+  &EnsurePnaclInstalled,
   &GetReadonlyPnaclFD,
   &CreateTemporaryFile,
   &GetNexeFd,