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

chrome/browser/nacl_host/nacl_host_message_filter.cc

Index: chrome/browser/nacl_host/nacl_host_message_filter.cc
diff --git a/chrome/browser/nacl_host/nacl_host_message_filter.cc b/chrome/browser/nacl_host/nacl_host_message_filter.cc
index ceecc2a5b840a4c5a093500b9b8e312706df0aa8..d4ae71fe8e2da886e4e5e28b03c0e44dc1783b44 100644
--- a/chrome/browser/nacl_host/nacl_host_message_filter.cc
+++ b/chrome/browser/nacl_host/nacl_host_message_filter.cc
@@ -56,6 +56,8 @@ bool NaClHostMessageFilter::OnMessageReceived(const IPC::Message& message,
   IPC_BEGIN_MESSAGE_MAP_EX(NaClHostMessageFilter, message, *message_was_ok)
 #if !defined(DISABLE_NACL)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(NaClHostMsg_LaunchNaCl, OnLaunchNaCl)
+    IPC_MESSAGE_HANDLER(NaClHostMsg_EnsurePnaclInstalled,
+                        OnEnsurePnaclInstalled)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(NaClHostMsg_GetReadonlyPnaclFD,
                                     OnGetReadonlyPnaclFd)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(NaClHostMsg_NaClCreateTemporaryFile,
@@ -96,6 +98,30 @@ void NaClHostMessageFilter::OnLaunchNaCl(
   host->Launch(this, reply_msg, manifest_url);
 }
 
+void NaClHostMessageFilter::ReplyEnsurePnaclInstalled(
+    int instance,
+    bool success) {
+  Send(new NaClViewMsg_EnsurePnaclInstalledReply(instance, success));
+}
+
+void NaClHostMessageFilter::SendProgressEnsurePnaclInstalled(
+    int instance,
+    int64_t current_progress,
+    int64_t total) {
+  Send(new NaClViewMsg_EnsurePnaclInstalledProgress(instance,
+                                                    current_progress,
+                                                    total));
+}
+
+void NaClHostMessageFilter::OnEnsurePnaclInstalled(
+    int instance) {
+  nacl_file_host::EnsurePnaclInstalled(
+      base::Bind(&NaClHostMessageFilter::ReplyEnsurePnaclInstalled,
+                 this, instance),
+      base::Bind(&NaClHostMessageFilter::SendProgressEnsurePnaclInstalled,
+                 this, instance));
+}
+
 void NaClHostMessageFilter::OnGetReadonlyPnaclFd(
     const std::string& filename, IPC::Message* reply_msg) {
   // This posts a task to another thread, but the renderer will